Rename apiimpl.Compiler to CompilerImpl.

tests/compiler/dart2js/js_backend_cps_ir_source_information_test.dart

 // Copyright (c) 2015, 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.
 
 // Test that the CPS IR code generator generates source information.
 
 library source_information_tests;
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/apiimpl.dart'
-       show Compiler;
+       show CompilerImpl;
 import 'memory_compiler.dart';
 import 'package:compiler/src/cps_ir/cps_ir_nodes.dart' as ir;
 import 'package:compiler/src/cps_ir/cps_ir_nodes_sexpr.dart' as ir;
 import 'package:compiler/src/js/js.dart' as js;
 import 'package:compiler/src/elements/elements.dart';
 
 const String TEST_MAIN_FILE = 'test.dart';
 
 class TestEntry {
   final String source;
   final List<String> expectation;
   final String elementName;
 
   const TestEntry(this.source, this.expectation)
     : elementName = null;
 
   const TestEntry.forMethod(this.elementName,
       this.source, this.expectation);
 }
 
 String formatTest(Map test) {
   return test[TEST_MAIN_FILE];
 }
 
-js.Node getCodeForMain(Compiler compiler) {
+js.Node getCodeForMain(CompilerImpl compiler) {
   Element mainFunction = compiler.mainFunction;
   return compiler.enqueuer.codegen.generatedCode[mainFunction];
 }
 
-js.Node getJsNodeForElement(Compiler compiler, Element element) {
+js.Node getJsNodeForElement(CompilerImpl compiler, Element element) {
   return compiler.enqueuer.codegen.generatedCode[element];
 }
 
-String getCodeForMethod(Compiler compiler, String name) {
+String getCodeForMethod(CompilerImpl compiler, String name) {
   Element foundElement;
   for (Element element in compiler.enqueuer.codegen.generatedCode.keys) {
     if (element.toString() == name) {
       if (foundElement != null) {
         Expect.fail('Multiple compiled elements are called $name');
       }
       foundElement = element;
     }
   }
 
   if (foundElement == null) {
     Expect.fail('There is no compiled element called $name');
   }
 
   js.Node ast = compiler.enqueuer.codegen.generatedCode[foundElement];
   return js.prettyPrint(ast, compiler).getText();
 }
 
 runTests(List<TestEntry> tests) {
   for (TestEntry test in tests) {
     Map files = {TEST_MAIN_FILE: test.source};
     asyncTest(() {
-      Compiler compiler = compilerFor(
+      CompilerImpl compiler = compilerFor(
           memorySourceFiles: files, options: <String>['--use-cps-ir']);
       ir.FunctionDefinition irNodeForMain;
 
       void cacheIrNodeForMain(Element function, ir.FunctionDefinition irNode) {
         if (function == compiler.mainFunction) {
           assert(irNodeForMain == null);
           irNodeForMain = irNode;
         }
       }
 
@@ skipping 61 matching lines @@
   print('Hello');
   print('World');
 }
 """, const ['memory:test.dart:[2,3]',
             'memory:test.dart:[3,3]']),
 ];
 
 void main() {
   runTests(tests);
 }