Convert the pp::proxy namespace to the ppapi::proxy namespace.

ppapi/proxy/ppb_video_capture_proxy.cc

Index: ppapi/proxy/ppb_video_capture_proxy.cc
diff --git a/ppapi/proxy/ppb_video_capture_proxy.cc b/ppapi/proxy/ppb_video_capture_proxy.cc
index a49b6e84cb4c8b874fdf9fbca404d0115bbc031c..cae0b22c52d9837c541d6556547b6493c8a54d7b 100644
--- a/ppapi/proxy/ppb_video_capture_proxy.cc
+++ b/ppapi/proxy/ppb_video_capture_proxy.cc
@@ -23,14 +23,12 @@
 #include "ppapi/thunk/ppb_video_capture_api.h"
 #include "ppapi/thunk/thunk.h"
 
-using ppapi::HostResource;
-using ppapi::Resource;
 using ppapi::thunk::EnterResourceNoLock;
 using ppapi::thunk::PPB_Buffer_API;
 using ppapi::thunk::PPB_BufferTrusted_API;
 using ppapi::thunk::PPB_VideoCapture_API;
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 namespace {
@@ -452,4 +450,4 @@ void PPP_VideoCapture_Proxy::OnMsgOnBufferReady(
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi