Convert remaining StringToLowerASCII to ToLowerASCII

ios/chrome/browser/chrome_url_util.mm

 // Copyright 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.
 
 #import "ios/chrome/browser/chrome_url_util.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_block.h"
@@ skipping 29 matching lines @@
   return url.SchemeIs(ios::GetChromeBrowserProvider()->GetChromeUIScheme());
 }
 
 bool UrlHasChromeScheme(NSURL* url) {
   return net::UrlSchemeIs(
       url, base::SysUTF8ToNSString(
                ios::GetChromeBrowserProvider()->GetChromeUIScheme()));
 }
 
 bool IsHandledProtocol(const std::string& scheme) {
-  DCHECK_EQ(scheme, base::StringToLowerASCII(scheme));
+  DCHECK_EQ(scheme, base::ToLowerASCII(scheme));
   if (scheme == url::kAboutScheme)
     return true;
   if (scheme == url::kDataScheme)
     return true;
   if (scheme == ios::GetChromeBrowserProvider()->GetChromeUIScheme())
     return true;
   return net::URLRequest::IsHandledProtocol(scheme);
 }
 
 @implementation ChromeAppConstants {
@@ skipping 45 matching lines @@
 
 - (void)setCallbackSchemeForTesting:(NSString*)scheme {
   _callbackScheme.reset([scheme copy]);
 }
 
 - (void)setAppIconURLProviderForTesting:(AppIconURLProvider)block {
   _appIconURLProvider.reset(block, base::scoped_policy::RETAIN);
 }
 
 @end