Use a direct include of strings headers in content/browser/, part 2.

content/browser/renderer_host/gtk_im_context_wrapper.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
 
 #include <gdk/gdk.h>
 #include <pango/pango-attributes.h>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 #include "ui/base/ime/composition_text.h"
 #include "ui/base/ime/text_input_type.h"
 
 typedef struct _GtkIMContext GtkIMContext;
 typedef struct _GtkWidget GtkWidget;
 
 namespace gfx {
 class Rect;
 }
@@ skipping 167 matching lines @@
   int last_key_code_;
   bool last_key_was_up_;
   bool last_key_filtered_no_result_;
 
   DISALLOW_COPY_AND_ASSIGN(GtkIMContextWrapper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_