Add explicit base namespace to string16 users.

chrome/common/extensions/manifest_handlers/app_launch_info.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_APP_LAUNCH_INFO_H_
 #define CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_APP_LAUNCH_INFO_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 26 matching lines @@
       const Extension* extension);
 
   // The default size of the container when launching. Only respected for
   // containers like panels and windows.
   static int GetLaunchWidth(const Extension* extension);
   static int GetLaunchHeight(const Extension* extension);
 
   // Get the fully resolved absolute launch URL.
   static GURL GetFullLaunchURL(const Extension* extension);
 
-  bool Parse(Extension* extension, string16* error);
+  bool Parse(Extension* extension, base::string16* error);
 
  private:
-  bool LoadLaunchURL(Extension* extension, string16* error);
-  bool LoadLaunchContainer(Extension* extension, string16* error);
+  bool LoadLaunchURL(Extension* extension, base::string16* error);
+  bool LoadLaunchContainer(Extension* extension, base::string16* error);
   void OverrideLaunchURL(Extension* extension, GURL override_url);
 
   std::string launch_local_path_;
 
   GURL launch_web_url_;
 
   LaunchContainer launch_container_;
 
   int launch_width_;
   int launch_height_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLaunchInfo);
 };
 
 // Parses all app launch related keys in the manifest.
 class AppLaunchManifestHandler : public ManifestHandler {
  public:
   AppLaunchManifestHandler();
   virtual ~AppLaunchManifestHandler();
 
-  virtual bool Parse(Extension* extension, string16* error) OVERRIDE;
+  virtual bool Parse(Extension* extension, base::string16* error) OVERRIDE;
   virtual bool AlwaysParseForType(Manifest::Type type) const OVERRIDE;
 
  private:
   virtual const std::vector<std::string> Keys() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(AppLaunchManifestHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_APP_LAUNCH_INFO_H_