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

chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac.mm

Index: chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac.mm
diff --git a/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac.mm b/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac.mm
index 87119f1443d656e963527ad7f851e291029e3f2c..e977243cac0bc5977c808a1fd91863297bb7819e 100644
--- a/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac.mm
+++ b/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac.mm
@@ -14,8 +14,6 @@
 #include "content/public/browser/browser_thread.h"
 #include "webkit/browser/fileapi/async_file_util.h"
 
-namespace chrome {
-
 namespace {
 
 int kReadDirectoryTimeLimitSeconds = 20;
@@ -478,6 +476,3 @@ void CreateMTPDeviceAsyncDelegate(
 
   cb.Run(new MTPDeviceDelegateImplMac(device_id, device_location));
 }
-
-}  // namespace chrome
-