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

chrome/browser/storage_monitor/mtab_watcher_linux.cc

Index: chrome/browser/storage_monitor/mtab_watcher_linux.cc
diff --git a/chrome/browser/storage_monitor/mtab_watcher_linux.cc b/chrome/browser/storage_monitor/mtab_watcher_linux.cc
index 9d72d9b14dbf5f06dec931c8974136126585b66b..225d45b689be633b0b139363f3d93ff9162d6ea7 100644
--- a/chrome/browser/storage_monitor/mtab_watcher_linux.cc
+++ b/chrome/browser/storage_monitor/mtab_watcher_linux.cc
@@ -12,8 +12,6 @@
 #include "base/bind.h"
 #include "content/public/browser/browser_thread.h"
 
-namespace chrome {
-
 namespace {
 
 // List of file systems we care about.
@@ -101,5 +99,3 @@ void MtabWatcherLinux::OnFilePathChanged(
 
   ReadMtab();
 }
-
-}  // namespace chrome