Use a direct include of strings headers in chrome/browser/ui/b*-p*/.

chrome/browser/ui/find_bar/find_bar.h

 // Copyright (c) 2011 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.
 //
 // This is an interface for the platform specific FindBar.  It is responsible
 // for drawing the FindBar bar on the platform and is owned by the
 // FindBarController.
 
 #ifndef CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_H_
 #define CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_H_
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/gfx/rect.h"
 
 class FindBarController;
 class FindBarTesting;
 class FindNotificationDetails;
 
 class FindBar {
  public:
   virtual ~FindBar() { }
 
@@ skipping 77 matching lines @@
   virtual string16 GetFindSelectedText() = 0;
 
   // Gets the match count text (ie. 1 of 3) visible in the Find box.
   virtual string16 GetMatchCountText() = 0;
 
   // Gets the pixel width of the FindBar.
   virtual int GetWidth() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_H_