Use explicit WebString conversions in remaining chrome/renderer files

chrome/renderer/chrome_render_frame_observer.cc

 // Copyright 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 "chrome/renderer/chrome_render_frame_observer.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include <limits>
@@ skipping 286 matching lines @@
     return;
 
   base::TimeTicks capture_begin_time = base::TimeTicks::Now();
 
   // Retrieve the frame's full text (up to kMaxIndexChars), and pass it to the
   // translate helper for language detection and possible translation.
   // TODO(dglazkov): WebFrameContentDumper should only be used for
   // testing purposes. See http://crbug.com/585164.
   base::string16 contents =
       WebFrameContentDumper::deprecatedDumpFrameTreeAsText(frame,
-                                                           kMaxIndexChars);
+                                                           kMaxIndexChars)
+          .utf16();
 
   UMA_HISTOGRAM_TIMES(kTranslateCaptureText,
                       base::TimeTicks::Now() - capture_begin_time);
 
   // We should run language detection only once. Parsing finishes before
   // the page loads, so let's pick that timing.
   if (translate_helper_ && capture_type == PRELIMINARY_CAPTURE)
     translate_helper_->PageCaptured(contents);
 
   TRACE_EVENT0("renderer", "ChromeRenderFrameObserver::CapturePageText");
@@ skipping 20 matching lines @@
       CapturePageText(FINAL_CAPTURE);
       break;
     default:
       break;
   }
 }
 
 void ChromeRenderFrameObserver::OnDestruct() {
   delete this;
 }