Rename InterfaceID to ApiID and move the file.

ppapi/proxy/interface_proxy.h

Index: ppapi/proxy/interface_proxy.h
diff --git a/ppapi/proxy/interface_proxy.h b/ppapi/proxy/interface_proxy.h
index 795944b43e501f81c58ea62ce7408f63372c1173..b9891b9cac79f58572e3fe731b48ca67e129fa50 100644
--- a/ppapi/proxy/interface_proxy.h
+++ b/ppapi/proxy/interface_proxy.h
@@ -11,7 +11,7 @@
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
-#include "ppapi/proxy/interface_id.h"
+#include "ppapi/shared_impl/api_id.h"
 #include "ppapi/shared_impl/function_group_base.h"
 
 namespace ppapi {
@@ -38,7 +38,7 @@ class InterfaceProxy : public IPC::Channel::Listener,
     const void* interface_ptr;
 
     const char* name;
-    InterfaceID id;
+    ApiID id;
 
     bool is_trusted;