Translate: make refresh mata tag check done in case insensitive

chrome/renderer/chrome_render_view_observer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/chrome_render_view_observer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 824 matching lines @@
 
 bool ChromeRenderViewObserver::HasRefreshMetaTag(WebFrame* frame) {
   if (!frame)
     return false;
   WebElement head = frame->document().head();
   if (head.isNull() || !head.hasChildNodes())
     return false;
 
   const WebString tag_name(ASCIIToUTF16("meta"));
   const WebString attribute_name(ASCIIToUTF16("http-equiv"));
-  const WebString attribute_value(ASCIIToUTF16("refresh"));
 
   WebNodeList children = head.childNodes();
   for (size_t i = 0; i < children.length(); ++i) {
     WebNode node = children.item(i);
     if (!node.isElementNode())
       continue;
     WebElement element = node.to<WebElement>();
     if (!element.hasTagName(tag_name))
       continue;
     WebString value = element.getAttribute(attribute_name);
-    if (value.isNull() || value != attribute_value)
+    if (value.isNull() || !LowerCaseEqualsASCII(value, "refresh"))
       continue;
     return true;
   }
   return false;
 }