Rename apiimpl.Compiler to CompilerImpl.

pkg/compiler/lib/compiler_new.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.
 
 /// New Compiler API. This API is under construction, use only internally or
 /// in unittests.
 
 library compiler_new;
 
 import 'dart:async';
@@ skipping 150 matching lines @@
   if (compilerInput == null) {
     throw new ArgumentError("compilerInput must be non-null");
   }
   if (compilerDiagnostics == null) {
     throw new ArgumentError("compilerDiagnostics must be non-null");
   }
   if (compilerOutput == null) {
     throw new ArgumentError("compilerOutput must be non-null");
   }
 
-  Compiler compiler = new Compiler(
+  CompilerImpl compiler = new CompilerImpl(
       compilerInput,
       compilerOutput,
       compilerDiagnostics,
       compilerOptions.libraryRoot,
       compilerOptions.packageRoot,
       compilerOptions.options,
       compilerOptions.environment,
       compilerOptions.packageConfig,
       compilerOptions.packagesDiscoveryProvider);
   return compiler.run(compilerOptions.entryPoint).then((bool success) {
     return new CompilationResult(compiler, isSuccess: success);
   });
 }