Move runner stuff into a runner namespace.

mojo/runner/android/android_handler_loader.h

Index: mojo/runner/android/android_handler_loader.h
diff --git a/mojo/runner/android/android_handler_loader.h b/mojo/runner/android/android_handler_loader.h
index 41d6e30ce54da8a2b7d1587e2a9eb65bf5c47adf..8979790bffc175698597478eb11c93dd3a7c4300 100644
--- a/mojo/runner/android/android_handler_loader.h
+++ b/mojo/runner/android/android_handler_loader.h
@@ -13,9 +13,9 @@
 #include "mojo/shell/application_loader.h"
 
 namespace mojo {
-namespace shell {
+namespace runner {
 
-class AndroidHandlerLoader : public ApplicationLoader {
+class AndroidHandlerLoader : public shell::ApplicationLoader {
  public:
   AndroidHandlerLoader();
   virtual ~AndroidHandlerLoader();
@@ -31,7 +31,7 @@ class AndroidHandlerLoader : public ApplicationLoader {
   DISALLOW_COPY_AND_ASSIGN(AndroidHandlerLoader);
 };
 
-}  // namespace shell
+}  // namespace runner
 }  // namespace mojo
 
 #endif  // MOJO_RUNNER_ANDROID_ANDROID_HANDLER_LOADER_H_