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

blimp/client/input/blimp_input_handler_wrapper.h

Index: blimp/client/input/blimp_input_handler_wrapper.h
diff --git a/blimp/client/input/blimp_input_handler_wrapper.h b/blimp/client/input/blimp_input_handler_wrapper.h
index 7bb55d876cd192aafa238b5963593f067b57837d..43a3a33506c86bb595ac9d6c04a524975fba9a72 100644
--- a/blimp/client/input/blimp_input_handler_wrapper.h
+++ b/blimp/client/input/blimp_input_handler_wrapper.h
@@ -12,6 +12,8 @@
 #include "ui/events/blink/input_handler_proxy_client.h"
 
 namespace blimp {
+namespace client {
+
 class BlimpInputManager;
 
 // The BlimpInputHandlerWrapper isolates all input handling processing done on
@@ -62,6 +64,7 @@ class BlimpInputHandlerWrapper : public ui::InputHandlerProxyClient {
   DISALLOW_COPY_AND_ASSIGN(BlimpInputHandlerWrapper);
 };
 
+}  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_INPUT_BLIMP_INPUT_HANDLER_WRAPPER_H_