Update V8 to r5425 as required by WebKit r67178

Change-Id: Ic338e7242d33e5a024bd5978f4a5a3a681af4ebd
diff --git a/src/x64/codegen-x64.h b/src/x64/codegen-x64.h
index 911ca16..07bdadf 100644
--- a/src/x64/codegen-x64.h
+++ b/src/x64/codegen-x64.h
@@ -591,9 +591,7 @@
   };
   static InlineRuntimeLUT* FindInlineRuntimeLUT(Handle<String> name);
   bool CheckForInlineRuntimeCall(CallRuntime* node);
-  static bool PatchInlineRuntimeEntry(Handle<String> name,
-                                      const InlineRuntimeLUT& new_entry,
-                                      InlineRuntimeLUT* old_entry);
+
   void ProcessDeclarations(ZoneList<Declaration*>* declarations);
 
   static Handle<Code> ComputeCallInitialize(int argc, InLoopFlag in_loop);