Remove a few unused functions.

ppapi/proxy/ppb_core_proxy.cc

Index: ppapi/proxy/ppb_core_proxy.cc
diff --git a/ppapi/proxy/ppb_core_proxy.cc b/ppapi/proxy/ppb_core_proxy.cc
index 06d5974d3351e394457add826cea85f1bd3ca400..391a914540086d156c61dcdfef7b08f4cb494e9b 100644
--- a/ppapi/proxy/ppb_core_proxy.cc
+++ b/ppapi/proxy/ppb_core_proxy.cc
@@ -41,14 +41,6 @@ void ReleaseResource(PP_Resource resource) {
   PluginResourceTracker::GetInstance()->ReleaseResource(resource);
 }
 
-void* MemAlloc(uint32_t num_bytes) {
-  return malloc(num_bytes);
-}
-
-void MemFree(void* ptr) {
-  free(ptr);
-}
-
 double GetTime() {
   return TimeToPPTime(base::Time::Now());
 }