Update the remaining include paths of base/string_piece.h to its new location.

webkit/support/platform_support_win.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 "webkit/support/platform_support.h"
 
 #include "base/base_paths.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/string16.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "base/win/resource_util.h"
 #include "grit/webkit_chromium_resources.h"
 #include "grit/webkit_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "webkit/support/test_webkit_platform_support.h"
 
 #define MAX_LOADSTRING 100
 
 namespace {
 
@@ skipping 82 matching lines @@
         LOG(FATAL) << "Failed reading: " << path.value();
       }
     }
     return resize_corner_data;
   }
   }
 
   // TODO(flackr): Pass scale_factor to ResourceProvider.
   return ResourceProvider(resource_id);
 }