Remove DartDocumentationGenerator and related flags.

compiler/java/com/google/dart/compiler/DartCompiler.java

Index: compiler/java/com/google/dart/compiler/DartCompiler.java
diff --git a/compiler/java/com/google/dart/compiler/DartCompiler.java b/compiler/java/com/google/dart/compiler/DartCompiler.java
index 4976d2f93646b04758391369b5b362884c6bfef7..09dcbc592758934f69cc1e7929a62e33b92d0784 100644
--- a/compiler/java/com/google/dart/compiler/DartCompiler.java
+++ b/compiler/java/com/google/dart/compiler/DartCompiler.java
@@ -29,7 +29,6 @@ import com.google.dart.compiler.metrics.DartEventType;
 import com.google.dart.compiler.metrics.JvmMetrics;
 import com.google.dart.compiler.metrics.Tracer;
 import com.google.dart.compiler.metrics.Tracer.TraceEvent;
-import com.google.dart.compiler.parser.CommentPreservingParser;
 import com.google.dart.compiler.parser.DartParser;
 import com.google.dart.compiler.parser.DartScanner.Location;
 import com.google.dart.compiler.parser.DartScannerParserContext;
@@ -128,7 +127,6 @@ public class DartCompiler {
     private final Map<URI, LibraryUnit> libraries = new LinkedHashMap<URI, LibraryUnit>();
     private boolean packageApp = false;
     private final boolean checkOnly;
-    private final boolean collectComments;
     private CoreTypeProvider typeProvider;
     private final boolean incremental;
     private final boolean usePrecompiledDartLibs;
@@ -144,7 +142,6 @@ public class DartCompiler {
       this.backends = config.getBackends();
       this.context = context;
       checkOnly = config.checkOnly();
-      collectComments = config.collectComments();
       for (LibrarySource library : embedded) {
         if (SystemLibraryManager.isDartSpec(library.getName())) {
           embeddedLibraries.add(context.getSystemLibraryFor(library.getName()));
@@ -819,9 +816,8 @@ public class DartCompiler {
         if (packageApp) {
           // When there's no entry-point in the application unit,
           // don't attempt to package it. This can happen when
-          // compileUnit() is called on a library. Always package app
-          // when generating documentation.
-          if (context.getApplicationUnit().getEntryNode() == null && !collectComments) {
+          // compileUnit() is called on a library.
+          if (context.getApplicationUnit().getEntryNode() == null) {
             if (config.expectEntryPoint()) {
               context.onError(new DartCompilationError(
                   context.getApplicationUnit().getSource(), Location.NONE,
@@ -865,17 +861,9 @@ public class DartCompiler {
           Closeables.close(r, failed);
         }
 
-        DartParser parser;
-        if (collectComments) {
-          DartScannerParserContext parserContext =
-              CommentPreservingParser.createContext(dartSrc, srcCode, context,
-                  context.getCompilerMetrics());
-          parser = new CommentPreservingParser(parserContext, false);
-        } else {
-          DartScannerParserContext parserContext =
-              new DartScannerParserContext(dartSrc, srcCode, context, context.getCompilerMetrics());
-          parser = new DartParser(parserContext, libraryPrefixes, diet);
-        }
+        DartScannerParserContext parserContext =
+            new DartScannerParserContext(dartSrc, srcCode, context, context.getCompilerMetrics());
+        DartParser parser = new DartParser(parserContext, libraryPrefixes, diet);
         DartUnit unit = parser.parseUnit(dartSrc);
         if (compilerMetrics != null) {
           compilerMetrics.addParseTimeNano(CompilerMetrics.getThreadTime() - parseStart);