Rename apiimpl.Compiler to CompilerImpl.

tests/compiler/dart2js/mirror_helper_unique_minification_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 import 'dart:async';
 import "package:async_helper/async_helper.dart";
 import 'memory_compiler.dart' show runCompiler;
 import 'package:compiler/src/apiimpl.dart' show
-    Compiler;
+    CompilerImpl;
 import 'package:compiler/src/dart_backend/dart_backend.dart' show
     DartBackend;
 import 'package:compiler/src/tree/tree.dart' show
     Identifier, Node, Send;
 import 'package:compiler/src/mirror_renamer/mirror_renamer.dart' show
     MirrorRenamerImpl;
 
 main() {
   asyncTest(() async {
     await testUniqueMinification();
     await testNoUniqueMinification();
   });
 }
 
-Future<Compiler> run({useMirrorHelperLibrary: false, minify: false}) async {
+Future<CompilerImpl> run({useMirrorHelperLibrary: false, minify: false}) async {
   List<String> options = ['--output-type=dart'];
   if (minify) {
     options.add('--minify');
   }
   var result = await runCompiler(
       memorySourceFiles: MEMORY_SOURCE_FILES,
       options: options,
-      beforeRun: (Compiler compiler) {
+      beforeRun: (CompilerImpl compiler) {
         DartBackend backend = compiler.backend;
         backend.useMirrorHelperLibrary = useMirrorHelperLibrary;
       });
   return result.compiler;
 }
 
 Future testUniqueMinification() async {
-  Compiler compiler = await run(useMirrorHelperLibrary: true, minify: true);
+  CompilerImpl compiler = await run(useMirrorHelperLibrary: true, minify: true);
   DartBackend backend = compiler.backend;
   MirrorRenamerImpl mirrorRenamer = backend.mirrorRenamer;
   Map<Node, String> renames = backend.placeholderRenamer.renames;
   Map<String, String> symbols = mirrorRenamer.symbols;
 
   // Check that no two different source code names get the same mangled name,
   // with the exception of MirrorSystem.getName that gets renamed to the same
   // mangled name as the getNameHelper from _mirror_helper.dart.
   for (Node node in renames.keys) {
     Identifier identifier = node.asIdentifier();
     if (identifier != null) {
       String source = identifier.source;
       Send send = mirrorRenamer.mirrorSystemGetNameNodes.first;
       if (send.selector == node)
         continue;
       if (symbols.containsKey(renames[node])) {
         print(node);
         Expect.equals(source, symbols[renames[node]]);
       }
     }
   }
 }
 
 Future testNoUniqueMinification() async {
-  Compiler compiler = await run(useMirrorHelperLibrary: false, minify: true);
+  CompilerImpl compiler =
+      await run(useMirrorHelperLibrary: false, minify: true);
   DartBackend backend = compiler.backend;
   Map<Node, String> renames = backend.placeholderRenamer.renames;
 
   // 'Foo' appears twice and 'invocation' and 'hest' get the same mangled
   // name.
   Expect.equals(renames.values.toSet().length, renames.values.length - 2);
 }
 
 const MEMORY_SOURCE_FILES = const <String, String> {
   'main.dart': """
 import 'dart:mirrors';
 
 class Foo {
   noSuchMethod(invocation) {
     MirrorSystem.getName(null);
   }
 }
 
 main(hest) {
   new Foo().fisk();
 }
 """};