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

ppapi/proxy/serialized_structs.h

Index: ppapi/proxy/serialized_structs.h
diff --git a/ppapi/proxy/serialized_structs.h b/ppapi/proxy/serialized_structs.h
index dac6540c25f0e564875dfefac9370e4c54b0d4a4..159ee390d09ca50bbce2fac23ba00d978d264e1e 100644
--- a/ppapi/proxy/serialized_structs.h
+++ b/ppapi/proxy/serialized_structs.h
@@ -20,7 +20,7 @@
 
 struct PP_FontDescription_Dev;
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 class Dispatcher;
@@ -55,7 +55,7 @@ struct SerializedFontDescription {
                               PP_FontDescription_Dev* desc,
                               bool dest_owns_ref) const;
 
-  pp::proxy::SerializedVar face;
+  SerializedVar face;
   int32_t family;
   uint32_t size;
   int32_t weight;
@@ -129,6 +129,6 @@ typedef int ImageHandle;
 #endif
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi
 
 #endif  // PPAPI_PROXY_SERIALIZED_STRUCTS_H_