Convert string16 to base::string16 in content.

content/browser/accessibility/accessibility_ui.cc

 // Copyright (c) 2013 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/accessibility/accessibility_ui.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/json/json_writer.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 215 matching lines @@
   RenderWidgetHostViewPort* host_view = static_cast<RenderWidgetHostViewPort*>(
       WebContents::FromRenderViewHost(rvh)->GetRenderWidgetHostView());
   if (!host_view) {
     result->Set("error",
                 new base::StringValue("Could not get accessibility tree."));
     web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
     return;
   }
   scoped_ptr<AccessibilityTreeFormatter> formatter(
       AccessibilityTreeFormatter::Create(rvh));
-  string16 accessibility_contents_utf16;
+  base::string16 accessibility_contents_utf16;
   BrowserAccessibilityManager* manager =
       host_view->GetBrowserAccessibilityManager();
   if (!manager) {
     result->Set("error",
                 new base::StringValue("Could not get accessibility tree."));
     web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
     return;
   }
   std::vector<AccessibilityTreeFormatter::Filter> filters;
   filters.push_back(AccessibilityTreeFormatter::Filter(
       ASCIIToUTF16("*"),
       AccessibilityTreeFormatter::Filter::ALLOW));
   formatter->SetFilters(filters);
   formatter->FormatAccessibilityTree(&accessibility_contents_utf16);
 
   result->Set("tree",
               new base::StringValue(UTF16ToUTF8(accessibility_contents_utf16)));
   web_ui()->CallJavascriptFunction("accessibility.showTree", *(result.get()));
 }
 
 }  // namespace content