Add base:: to string16 in content/.

content/browser/web_contents/web_contents_impl.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/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1622 matching lines @@
     SiteInstance* instance) {
   return controller_.GetSessionStorageNamespace(instance);
 }
 
 FrameTree* WebContentsImpl::GetFrameTree() {
   return &frame_tree_;
 }
 
 void WebContentsImpl::OnShowValidationMessage(
     const gfx::Rect& anchor_in_root_view,
-    const string16& main_text,
-    const string16& sub_text) {
+    const base::string16& main_text,
+    const base::string16& sub_text) {
   if (delegate_)
     delegate_->ShowValidationMessage(
         this, anchor_in_root_view, main_text, sub_text);
 }
 
 void WebContentsImpl::OnHideValidationMessage() {
   if (delegate_)
     delegate_->HideValidationMessage(this);
 }
 
@@ skipping 2169 matching lines @@
 }
 
 void WebContentsImpl::OnFrameRemoved(
     RenderViewHostImpl* render_view_host,
     int64 frame_id) {
    FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                      FrameDetached(render_view_host, frame_id));
 }
 
 }  // namespace content