[Blimp client] Move client code into blimp::client namespace

blimp/client/input/blimp_input_manager.h

Index: blimp/client/input/blimp_input_manager.h
diff --git a/blimp/client/input/blimp_input_manager.h b/blimp/client/input/blimp_input_manager.h
index 7acddd4f09415fe03111f4293115e425a7b6a44c..2e4ede0a2e83ddd0d02edf04e036d2ebde05a937 100644
--- a/blimp/client/input/blimp_input_manager.h
+++ b/blimp/client/input/blimp_input_manager.h
@@ -15,6 +15,7 @@
 #include "ui/events/gesture_detection/motion_event.h"
 
 namespace blimp {
+namespace client {
 
 class BlimpInputManagerClient {
  public:
@@ -101,6 +102,7 @@ class BlimpInputManager : public ui::GestureProviderClient {
   DISALLOW_COPY_AND_ASSIGN(BlimpInputManager);
 };
 
+}  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_INPUT_BLIMP_INPUT_MANAGER_H_