Removed some URL Utility functions & improved unit tests

ios/chrome/browser/chrome_url_util.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_CHROME_URL_UTIL_H_
 #define IOS_CHROME_BROWSER_CHROME_URL_UTIL_H_
 
 #import <Foundation/Foundation.h>
 
 #include <string>
 
 class GURL;
 
 // Returns whether |url| is an external file reference.
 bool UrlIsExternalFileReference(const GURL& url);
 
-// Returns a URL that launches Chrome.
-NSURL* UrlToLaunchChrome();
-
-// Returns the URL for the iOS App Icon for Chrome.
-NSURL* UrlOfChromeAppIcon(int width, int height);
-
 // Returns true if the scheme has a chrome scheme.
 bool UrlHasChromeScheme(const GURL& url);
 bool UrlHasChromeScheme(NSURL* url);
 
 // Returns true if |scheme| is handled in Chrome, or by default handlers in
 // net::URLRequest.
 bool IsHandledProtocol(const std::string& scheme);
 
 // Singleton object that generates constants for Chrome iOS applications.
 // Behavior of this object can be overridden by unit tests.
 @interface ChromeAppConstants : NSObject
 
 // Class method returning the singleton instance.
 + (ChromeAppConstants*)sharedInstance;
 
 // Returns the URL scheme that launches Chrome.
 - (NSString*)getBundleURLScheme;
 
-// Returns the URL string to the Chrome application icon.
-- (NSString*)getChromeAppIconURLOfWidth:(int)width height:(int)height;
-
 // Method to set the scheme to callback Chrome iOS for testing.
 - (void)setCallbackSchemeForTesting:(NSString*)callbackScheme;
 
-// Method to set a different block to provider the App Icon URL.
-typedef NSString* (^AppIconURLProvider)(int, int);
-- (void)setAppIconURLProviderForTesting:(AppIconURLProvider)block;
-
 @end
 
 #endif  // IOS_CHROME_BROWSER_CHROME_URL_UTIL_H_