Get rid of last uses of deprecated toWebCoreString(v8::Handle<v8::Value>)

Source/bindings/v8/custom/V8WindowCustom.cpp

 /*
  * Copyright (C) 2009, 2011 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 77 matching lines @@
         exceptionState.throwDOMException(InvalidAccessError, "No script context is available in which to execute the script.");
         return;
     }
 
     v8::Handle<v8::Value> function = info[0];
     String functionString;
     if (!function->IsFunction()) {
         if (function->IsString()) {
             functionString = toWebCoreString(function.As<v8::String>());
         } else {
-            v8::Handle<v8::Value> v8String = function->ToString();
+            v8::Handle<v8::String> v8String = function->ToString();
 
             // Bail out if string conversion failed.
             if (v8String.IsEmpty())
                 return;
 
             functionString = toWebCoreString(v8String);
         }
 
         // Don't allow setting timeouts to run empty functions!
         // (Bug 1009597)
@@ skipping 457 matching lines @@
     v8::Handle<v8::Context> context = frame->script().currentWorldContext();
     if (context.IsEmpty())
         return v8Undefined();
 
     v8::Handle<v8::Object> global = context->Global();
     ASSERT(!global.IsEmpty());
     return global;
 }
 
 } // namespace WebCore