Fix bugs in parser and update tests to use new directive syntax

compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java

Index: compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java
===================================================================
--- compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java	(revision 10652)
+++ compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java	(working copy)
@@ -174,8 +174,8 @@
     assertEquals(
         Joiner.on("\n").join(
             "// unit QualifiedReturnTypeB.dart",
-            "#library(\"test\");",
-            "#import(\"QualifiedReturnTypeA.dart\", prefix : \"pref\");",
+            "library test;",
+            "import \"QualifiedReturnTypeA.dart\" as pref;",
             "class A {",
             "",
             "  pref.A foo() {",
@@ -1061,17 +1061,6 @@
             ParserErrorCode.OPERATOR_CANNOT_BE_STATIC, 2, 10);
   }
 
-  public void test_expectedPrefixIdentifier() throws Exception {
-    parseUnit("phony_expected_prefix_identifier.dart",
-        Joiner.on("\n").join(
-            "#import(\"l.dart\", postfix : \"l\");",
-            "#import(\"l.dart\", );",
-            "#import(\"l.dart\", prefix : \"1\");"),
-            ParserErrorCode.EXPECTED_PREFIX_KEYWORD, 1, 17,
-            ParserErrorCode.EXPECTED_PREFIX_KEYWORD, 2, 17,
-            ParserErrorCode.EXPECTED_PREFIX_IDENTIFIER, 3, 28);
-  }
-
   public void test_nonFinalStaticMemberInInterface() throws Exception {
     parseUnit("phony_non_final_static_member_in_interface.dart",
         Joiner.on("\n").join(