Make various string_util functions take StringPieces instead of char[].

chrome/browser/renderer_context_menu/render_view_context_menu.cc

 // Copyright 2014 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/browser/renderer_context_menu/render_view_context_menu.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 354 matching lines @@
       }
       default:
         NOTREACHED();
         break;
     }
   }
 }
 
 // Helper function to escape "&" as "&&".
 void EscapeAmpersands(base::string16* text) {
-  const base::char16 ampersand[] = {'&', 0};
-  base::ReplaceChars(*text, ampersand, base::ASCIIToUTF16("&&"), text);
+  base::ReplaceChars(*text, base::ASCIIToUTF16("&"), base::ASCIIToUTF16("&&"),
+                     text);
 }
 
 }  // namespace
 
 // static
 const size_t RenderViewContextMenu::kMaxSelectionTextLength = 50;
 
 // static
 bool RenderViewContextMenu::IsDevToolsURL(const GURL& url) {
   return url.SchemeIs(content::kChromeDevToolsScheme);
@@ skipping 1600 matching lines @@
   source_web_contents_->GetRenderViewHost()->
       ExecuteMediaPlayerActionAtLocation(location, action);
 }
 
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }