Use a direct include of strings headers in extensions/, google_apis/, gpu/.

gpu/command_buffer/service/program_manager_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/program_manager.h"
 
 #include <algorithm>
 
 #include "base/memory/scoped_ptr.h"
-#include "base/string_number_conversions.h"
-#include "base/string_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/common_decoder.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/mocks.h"
 #include "gpu/command_buffer/service/shader_manager.h"
 #include "gpu/command_buffer/service/test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_mock.h"
 
@@ skipping 1517 matching lines @@
                                   new_vertex_shader,
                                   fragment_shader_);
   SetExpectationsForProgramLink(kNewProgramServiceId);
 
   EXPECT_TRUE(program->Link(&shader_manager_, NULL, NULL,
                             info.get(), base::Bind(&ShaderCacheCb)));
 }
 
 }  // namespace gles2
 }  // namespace gpu