Remove dartc optimizing backend.

dart/compiler/dartc.xml

 <project default="dist">
   <import file="sources.xml"/>
   <import file="test_sources.xml"/>
   <import file="corelib_sources.xml"/>
   <import file="compiler_corelib_sources.xml"/>
   <import file="domlib_sources.xml"/>
   <import file="htmllib_sources.xml"/>
   <import file="jsonlib_sources.xml"/>
 
   <!--
@@ skipping 31 matching lines @@
   <property name="dist.dir" value="${build.dir}/dist"/>
 
   <property name="test.report.dir" value="${build.dir}/test"/>
 
   <property name="third_party.dir" value="../third_party"/>
 
   <property name="d8" value="$DARTC_HOME/bin/d8.$OS"/>
 
   <property name="test_py" location="../tools/test.py"/>
 
-  <property name="closure_compiler.jar" value="${build.dir}/../closure_out/compiler.jar"/>
-
   <!--
     Define buildtime and runtime classpaths.
   -->
   <path id="classpath.compile">
     <pathelement location="${third_party.dir}/args4j/2.0.12/args4j-2.0.12.jar"/>
-    <pathelement location="${closure_compiler.jar}" />
     <pathelement location="${third_party.dir}/guava/r09/guava-r09.jar"/>
     <pathelement location="${third_party.dir}/json/r2_20080312/json.jar"/>
     <pathelement location="${third_party.dir}/rhino/1_7R3/js.jar"/>
   </path>
 
   <path id="classpath.runtime">
     <path refid="classpath.compile"/>
   </path>
 
   <path id="classpath.compile.tests">
@@ skipping 128 matching lines @@
     -->
     <mkdir dir="${dist.dir}/bin"/>
     <mkdir dir="${dist.dir}/lib"/>
 
     <!--
       Copy the dart jar to the lib folder.
     -->
     <copy file="${dartc.jar}" todir="${dist.dir}/lib"/>
 
     <!--
-      Copy the closure-compiler jar to the lib folder.
-    -->
-    <copy file="${closure_compiler.jar}" tofile="${dist.dir}/lib/closure-compiler.jar"/>
-
-    <!--
       Re-root the classpaths from third_party into the lib folder of the distro.
     -->
     <pathconvert property="dartc.classpath.runtime.unix" targetos="unix" refid="classpath.runtime">
       <regexpmapper from="${third_party.dir}/(.*)" to="$DARTC_LIBS/\1"/>
     </pathconvert>
 
     <copy file="scripts/dartc.sh" tofile="${dist.dir}/bin/dartc">
       <filterset>
-        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:$DARTC_LIBS/closure-compiler.jar:${dartc.classpath.runtime.unix}"/>
+        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:${dartc.classpath.runtime.unix}"/>
       </filterset>
     </copy>
     <chmod file="${dist.dir}/bin/dartc" perm="a+rx"/>
 
     <copy file="scripts/dartc_test.sh" tofile="${dist.dir}/bin/dartc_test">
       <filterset>
-        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:$DARTC_LIBS/closure-compiler.jar:${dartc.classpath.runtime.unix}"/>
+        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:${dartc.classpath.runtime.unix}"/>
         <filter token="D8_EXEC" value="${d8}"/>
       </filterset>
     </copy>
     <chmod file="${dist.dir}/bin/dartc_test" perm="a+rx"/>
 
    <!--
       TODO: The following files are not strictly due to dist, move them out.
     -->
     <copy todir="${build.dir}">
       <fileset dir="scripts">
         <include name="dartc_run.sh"/>
         <include name="dartc_size.sh"/>
         <include name="dartc_metrics.sh"/>
       </fileset>
       <filterset>
-        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:$DARTC_LIBS/closure-compiler.jar:${dartc.classpath.runtime.unix}"/>
+        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:${dartc.classpath.runtime.unix}"/>
       </filterset>
     </copy>
     <chmod file="${build.dir}/dartc_run.sh" perm="a+rx"/>
     <chmod file="${build.dir}/dartc_size.sh" perm="a+rx"/>
     <chmod file="${build.dir}/dartc_metrics.sh" perm="a+rx"/>
 
     <!--
       Copy of all of the dartc dependencies to the lib folder.
     -->
     <copy todir="${dist.dir}/lib">
       <path refid="classpath.runtime"/>
       <regexpmapper from="${third_party.dir}/(.*)" to="\1"/>
     </copy>
   </target>
 
   <target name="clean" description="Deletes the build output directory.">
     <delete dir="${build.dir}"/>
     <delete dir="${dist.dir}"/>
   </target>
 
   <target name="tests.jar" depends="compile-tests">
     <jar destfile="${build.dir}/tests.jar" basedir="${build.test.classes.dir}"/>
   </target>
 </project>