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

chrome/browser/media_galleries/win/portable_device_map_service.cc

Index: chrome/browser/media_galleries/win/portable_device_map_service.cc
diff --git a/chrome/browser/media_galleries/win/portable_device_map_service.cc b/chrome/browser/media_galleries/win/portable_device_map_service.cc
index 986d8f45ed8ff835c8b68b85ed14013a81ec2d32..557353eaa7dedfa79a836a5d0ec4bd03af05f6bc 100644
--- a/chrome/browser/media_galleries/win/portable_device_map_service.cc
+++ b/chrome/browser/media_galleries/win/portable_device_map_service.cc
@@ -9,8 +9,6 @@
 #include "base/threading/thread_restrictions.h"
 #include "content/public/browser/browser_thread.h"
 
-namespace chrome {
-
 namespace {
 
 base::LazyInstance<PortableDeviceMapService> g_portable_device_map_service =
@@ -78,5 +76,3 @@ PortableDeviceMapService::PortableDeviceMapService() {
 
 PortableDeviceMapService::~PortableDeviceMapService() {
 }
-
-}  // namespace chrome