Build fix after r196376

Source/wtf/DefaultAllocator.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 117 matching lines @@
     deleteArray(void* ptr)
     {
         free(ptr); // Not the system free, the one from this class.
     }
 
     static bool isAllocationAllowed() { return true; }
     template<typename T>
     static bool isHeapObjectAlive(T* object)
     {
         ASSERT_NOT_REACHED();
+        return false;
     }
 
     static void markNoTracing(...)
     {
         ASSERT_NOT_REACHED();
     }
 
     static void registerDelayedMarkNoTracing(...)
     {
         ASSERT_NOT_REACHED();
@@ skipping 69 matching lines @@
     { \
         ASSERT(location); \
         return location; \
     } \
 private: \
 typedef int __thisIsHereToForceASemicolonAfterThisMacro
 
 using WTF::DefaultAllocator;
 
 #endif // WTF_DefaultAllocator_h