Use the mojo::shell namespace consistently underly shell/.

shell/application_manager/local_fetcher.h

Index: shell/application_manager/local_fetcher.h
diff --git a/shell/application_manager/local_fetcher.h b/shell/application_manager/local_fetcher.h
index 8701e9d2afc7b4a3998957e472a52e2725b66bae..19ace2de758b0eb3c125fd1fe64cecf083441d4c 100644
--- a/shell/application_manager/local_fetcher.h
+++ b/shell/application_manager/local_fetcher.h
@@ -11,6 +11,7 @@
 #include "url/gurl.h"
 
 namespace mojo {
+namespace shell {
 
 // Implements Fetcher for file:// URLs.
 class LocalFetcher : public Fetcher {
@@ -44,6 +45,7 @@ class LocalFetcher : public Fetcher {
   DISALLOW_COPY_AND_ASSIGN(LocalFetcher);
 };
 
-#endif  // SHELL_APPLICATION_MANAGER_LOCAL_FETCHER_H_
-
+}  // namespace shell
 }  // namespace mojo
+
+#endif  // SHELL_APPLICATION_MANAGER_LOCAL_FETCHER_H_