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

android_webview/renderer/aw_render_view_ext.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 "android_webview/renderer/aw_render_view_ext.h"
 
 #include <string>
 
 #include "android_webview/common/aw_hit_test_data.h"
 #include "android_webview/common/render_view_messages.h"
 #include "android_webview/common/renderer_picture_map.h"
 #include "base/bind.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/renderer/android_content_detection_prefixes.h"
 #include "content/public/renderer/document_state.h"
 #include "content/public/renderer/render_view.h"
 #include "skia/ext/refptr.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebSize.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebURL.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebVector.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDataSource.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
@@ skipping 241 matching lines @@
 }
 
 void AwRenderViewExt::OnSetInitialPageScale(double page_scale_factor) {
   if (!render_view() || !render_view()->GetWebView())
     return;
   render_view()->GetWebView()->setInitialPageScaleOverride(
       page_scale_factor);
 }
 
 }  // namespace android_webview