Move StringPiece into the base namespace. It is colliding

chrome/browser/extensions/user_script_master.h

 // Copyright (c) 2008 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_BROWSER_EXTENSIONS_USER_SCRIPT_MASTER_H_
 #define CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_MASTER_H_
 
 #include <vector>
 
 #include "base/directory_watcher.h"
 #include "base/file_path.h"
 #include "base/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "chrome/common/extensions/user_script.h"
 #include "chrome/common/notification_registrar.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 class MessageLoop;
+namespace base {
 class StringPiece;
+}
 
 // Manages a segment of shared memory that contains the user scripts the user
 // has installed.  Lives on the UI thread.
 class UserScriptMaster : public base::RefCounted<UserScriptMaster>,
                          public DirectoryWatcher::Delegate,
                          public NotificationObserver {
  public:
   // For testability, the constructor takes the MessageLoop to run the
   // script-reloading worker on as well as the path the scripts live in.
   // These are normally the file thread and a directory inside the profile.
@@ skipping 33 matching lines @@
   // We reload user scripts on the file thread to prevent blocking the UI.
   // ScriptReloader lives on the file thread and does the reload
   // work, and then sends a message back to its master with a new SharedMemory*.
   // ScriptReloader is the worker that manages running the script scan
   // on the file thread. It must be created on, and its public API must only be
   // called from, the master's thread.
   class ScriptReloader
       : public base::RefCounted<UserScriptMaster::ScriptReloader> {
    public:
     // Parses the includes out of |script| and returns them in |includes|.
-    static bool ParseMetadataHeader(const StringPiece& script_text,
+    static bool ParseMetadataHeader(const base::StringPiece& script_text,
                                     UserScript* script);
 
     static void LoadScriptsFromDirectory(const FilePath& script_dir,
                                          UserScriptList* result);
 
     explicit ScriptReloader(UserScriptMaster* master);
 
     // Start a scan for scripts.
     // Will always send a message to the master upon completion.
     void StartScan(MessageLoop* work_loop, const FilePath& script_dir,
@@ skipping 70 matching lines @@
 
   // If the script directory is modified while we're rescanning it, we note
   // that we're currently mid-scan and then start over again once the scan
   // finishes.  This boolean tracks whether another scan is pending.
   bool pending_scan_;
 
   DISALLOW_COPY_AND_ASSIGN(UserScriptMaster);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_MASTER_H_