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

chrome/browser/storage_monitor/mtab_watcher_linux.h

Index: chrome/browser/storage_monitor/mtab_watcher_linux.h
diff --git a/chrome/browser/storage_monitor/mtab_watcher_linux.h b/chrome/browser/storage_monitor/mtab_watcher_linux.h
index 811236a4d420915a614c304f6eb1978c50c8e278..cc4140d4f8af5f040fad61cd59dea5d222a0a1b1 100644
--- a/chrome/browser/storage_monitor/mtab_watcher_linux.h
+++ b/chrome/browser/storage_monitor/mtab_watcher_linux.h
@@ -20,8 +20,6 @@
 #include "base/files/file_path_watcher.h"
 #include "base/memory/weak_ptr.h"
 
-namespace chrome {
-
 class MtabWatcherLinux {
  public:
   // (mount point, mount device)
@@ -61,6 +59,4 @@ class MtabWatcherLinux {
   DISALLOW_COPY_AND_ASSIGN(MtabWatcherLinux);
 };
 
-}  // namespace chrome
-
 #endif  // CHROME_BROWSER_STORAGE_MONITOR_MTAB_WATCHER_LINUX_H_