Use a direct include of strings headers in content/renderer and content/shell.

content/renderer/gpu/gpu_benchmarking_extension.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 "content/renderer/gpu/gpu_benchmarking_extension.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_vector.h"
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 #include "content/common/browser_rendering_stats.h"
 #include "content/common/gpu/gpu_rendering_stats.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/renderer/all_rendering_benchmarks.h"
 #include "content/renderer/gpu/render_widget_compositor.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/rendering_benchmark.h"
 #include "content/renderer/skia_benchmarking_extension.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebImageCache.h"
@@ skipping 541 matching lines @@
 
     return v8::Undefined();
   }
 };
 
 v8::Extension* GpuBenchmarkingExtension::Get() {
   return new GpuBenchmarkingWrapper();
 }
 
 }  // namespace content