Oilpan: Vector::reserveCapacity shouldn't reallocate backing storage always

Source/wtf/DefaultAllocator.h

Index: Source/wtf/DefaultAllocator.h
diff --git a/Source/wtf/DefaultAllocator.h b/Source/wtf/DefaultAllocator.h
index c87bfb11ff3ed503e7eac3bf1d353f6acbcddc0c..1b225542d22f156b5fa3b7cf0c76f00c8aaac4d7 100644
--- a/Source/wtf/DefaultAllocator.h
+++ b/Source/wtf/DefaultAllocator.h
@@ -88,6 +88,10 @@ public:
         return reinterpret_cast<Return>(fastMalloc(size));
     }
     WTF_EXPORT static void backingFree(void* address);
+    WTF_EXPORT static inline bool backingExpand(void*, size_t)
+    {
+        return false;
+    }
     static void free(void* address)
     {
         fastFree(address);