Continuation of CL 5685007, rename the singleton accessor method in more files.

chrome/browser/chromeos/usb_mount_observer.h

 // Copyright (c) 2009 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_CHROMEOS_USB_MOUNT_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_USB_MOUNT_OBSERVER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 14 matching lines @@
 // a new mounted usb device is found.
 class USBMountObserver : public chromeos::MountLibrary::Observer,
                          public NotificationObserver {
  public:
   struct BrowserWithPath {
     Browser* browser;
     std::string device_path;
     std::string mount_path;
   };
 
-  static USBMountObserver* Get();
+  static USBMountObserver* GetInstance();
 
   void Observe(NotificationType type,
                const NotificationSource& source,
                const NotificationDetails& details);
 
   void MountChanged(chromeos::MountLibrary* obj,
                     chromeos::MountEventType evt,
                     const std::string& path);
 
   void ScanForDevices(chromeos::MountLibrary* obj);
@@ skipping 15 matching lines @@
                       bool small);
 
   std::vector<BrowserWithPath> browsers_;
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(USBMountObserver);
 };
 
 } // namespace chromeos
 #endif  // CHROME_BROWSER_CHROMEOS_USB_MOUNT_OBSERVER_H_