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

chrome/browser/storage_monitor/transient_device_ids.cc

Index: chrome/browser/storage_monitor/transient_device_ids.cc
diff --git a/chrome/browser/storage_monitor/transient_device_ids.cc b/chrome/browser/storage_monitor/transient_device_ids.cc
index 850c17cbb9d51b803d4e71a6733c5970a1b71178..6027044f84cda57d187261c89ff4fead95190d05 100644
--- a/chrome/browser/storage_monitor/transient_device_ids.cc
+++ b/chrome/browser/storage_monitor/transient_device_ids.cc
@@ -11,8 +11,6 @@
 #include "base/stl_util.h"
 #include "chrome/browser/storage_monitor/storage_info.h"
 
-namespace chrome {
-
 TransientDeviceIds::TransientDeviceIds() {}
 
 TransientDeviceIds::~TransientDeviceIds() {}
@@ -41,5 +39,3 @@ std::string TransientDeviceIds::DeviceIdFromTransientId(
     return std::string();
   return it->second;
 }
-
-}  // namespace chrome