Cleanup: Remove chrome namespace for storage monitor and media galleries.

chrome/browser/media_galleries/mtp_device_delegate_impl.h

Index: chrome/browser/media_galleries/mtp_device_delegate_impl.h
diff --git a/chrome/browser/media_galleries/mtp_device_delegate_impl.h b/chrome/browser/media_galleries/mtp_device_delegate_impl.h
index f23c187bee2fd95d7a75ed9a1eb9962eb34654ef..407f7b80f8763c433517e05f60e28d555b843523 100644
--- a/chrome/browser/media_galleries/mtp_device_delegate_impl.h
+++ b/chrome/browser/media_galleries/mtp_device_delegate_impl.h
@@ -13,8 +13,6 @@ namespace base {
 class SequencedTaskRunner;
 }
 
-namespace chrome {
-
 typedef base::Callback<void(MTPDeviceAsyncDelegate*)>
     CreateMTPDeviceAsyncDelegateCallback;
 
@@ -22,6 +20,4 @@ void CreateMTPDeviceAsyncDelegate(
     const base::FilePath::StringType& device_location,
     const CreateMTPDeviceAsyncDelegateCallback& callback);
 
-}  // namespace chrome
-
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_MTP_DEVICE_DELEGATE_IMPL_H_