Bug 1175147 - Don't do threadsafety asserts for NPN_MemAlloc and friends, r=jimm

dom/plugins/ipc/PluginModuleChild.cpp

@@ -1329,17 +1329,12 @@ void
 _memfree(void* aPtr)
 {
     PLUGIN_LOG_DEBUG_FUNCTION;
-    // Only assert plugin thread here for consistency with in-process plugins.
-    AssertPluginThread();
     free(aPtr);
 }
 
 uint32_t
 _memflush(uint32_t aSize)
 {
-    PLUGIN_LOG_DEBUG_FUNCTION;
-    // Only assert plugin thread here for consistency with in-process plugins.
-    AssertPluginThread();
     return 0;
 }
 
@@ -1398,8 +1393,6 @@ void*
 _memalloc(uint32_t aSize)
 {
     PLUGIN_LOG_DEBUG_FUNCTION;
-    // Only assert plugin thread here for consistency with in-process plugins.
-    AssertPluginThread();
     return moz_xmalloc(aSize);
 }