Use a direct include of strings headers in content/p*/.

content/public/test/render_widget_test.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/public/test/render_widget_test.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted_memory.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "content/common/view_messages.h"
 #include "content/renderer/render_view_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 #include "ui/gfx/codec/jpeg_codec.h"
 #include "ui/gfx/size.h"
 #include "ui/surface/transport_dib.h"
 
@@ skipping 174 matching lines @@
   EXPECT_FALSE(widget->next_paint_is_resize_ack());
 
   // Resetting the rect to empty should not send the ack.
   resize_params.new_size = gfx::Size();
   resize_params.physical_backing_size = gfx::Size();
   widget->OnResize(resize_params);
   EXPECT_FALSE(widget->next_paint_is_resize_ack());
 }
 
 }  // namespace content