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

ppapi/proxy/ppp_class_proxy.cc

Index: ppapi/proxy/ppp_class_proxy.cc
diff --git a/ppapi/proxy/ppp_class_proxy.cc b/ppapi/proxy/ppp_class_proxy.cc
index 0a020cc07979a84828d3db5fd52461bf195d24cc..11d42393e62a15c8ec90c6986b49a0de4f1e2a21 100644
--- a/ppapi/proxy/ppp_class_proxy.cc
+++ b/ppapi/proxy/ppp_class_proxy.cc
@@ -11,7 +11,7 @@
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/serialized_var.h"
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 namespace {
@@ -243,7 +243,7 @@ void PPP_Class_Proxy::OnMsgGetProperty(int64 ppp_class, int64 object,
 
 void PPP_Class_Proxy::OnMsgEnumerateProperties(
     int64 ppp_class, int64 object,
-    std::vector<pp::proxy::SerializedVar>* props,
+    std::vector<SerializedVar>* props,
     SerializedVarOutParam exception) {
   NOTIMPLEMENTED();
   // TODO(brettw) implement this.
@@ -295,4 +295,4 @@ void PPP_Class_Proxy::OnMsgDeallocate(int64 ppp_class, int64 object) {
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi