Make a global enum to differentiate impl & proxy.

ppapi/shared_impl/ppb_input_event_shared.cc

Index: ppapi/shared_impl/ppb_input_event_shared.cc
diff --git a/ppapi/shared_impl/ppb_input_event_shared.cc b/ppapi/shared_impl/ppb_input_event_shared.cc
index 2cffa0f295b0cd0c06e445650a21c357adfea40e..7bd82a767a430d80e97abf3863231e9dd8cf0f57 100644
--- a/ppapi/shared_impl/ppb_input_event_shared.cc
+++ b/ppapi/shared_impl/ppb_input_event_shared.cc
@@ -32,17 +32,10 @@ InputEventData::InputEventData()
 InputEventData::~InputEventData() {
 }
 
-PPB_InputEvent_Shared::PPB_InputEvent_Shared(const InitAsImpl&,
+PPB_InputEvent_Shared::PPB_InputEvent_Shared(ResourceObjectType type,
                                              PP_Instance instance,
                                              const InputEventData& data)
-    : Resource(instance),
-      data_(data) {
-}
-
-PPB_InputEvent_Shared::PPB_InputEvent_Shared(const InitAsProxy&,
-                                             PP_Instance instance,
-                                             const InputEventData& data)
-    : Resource(HostResource::MakeInstanceOnly(instance)),
+    : Resource(type, instance),
       data_(data) {
 }