[ios] Removed UIWebView JS evaluation code.

ios/web/web_state/ui/web_view_js_utils.h

 // Copyright 2014 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_WEB_WEB_STATE_UI_WEB_VIEW_JS_UTILS_H_
 #define IOS_WEB_WEB_STATE_UI_WEB_VIEW_JS_UTILS_H_
 
 #import <Foundation/Foundation.h>
 
 #include "ios/web/public/block_types.h"
 
-@class UIWebView;
 @class WKWebView;
 
-// This file contains functions that asynchronously evaluate JavaScript on
-// WKWebView/UIWebView and provide result in the same format. Call
-// |completion_handler| with results of the evaluation or an NSError if there is
-// an error. The |completion_handler| can be nil.
 namespace web {
 
 // The domain for JS evaluation NSErrors in web.
 extern NSString* const kJSEvaluationErrorDomain;
 
 // The type of errors that can occur while evaluating JS.
 enum JSEvaluationErrorCode {
   // No web view present to evaluate JS.
   JS_EVALUATION_ERROR_CODE_NO_WEB_VIEW = 1,
 };
 
-// The error code for JS evaluation NSErrors.
-extern const NSInteger kJSEvaluationErrorCode;
-
-// Asynchronous adaptor to evaluate JavaScript on UIWebView. Provides evaluation
-// result as it is, without modifications.
-void EvaluateJavaScript(UIWebView* web_view,
-                        NSString* script,
-                        JavaScriptCompletion completion_handler);
-
-// Evaluates JavaScript on WKWebView. Provides evaluation result in the same
-// format as UIWebView. If the web view cannot evaluate JS at the moment,
-// |completion_handler| is called with an NSError.
+// Evaluates JavaScript on WKWebView. Provides evaluation result as a string.
+// If the web view cannot evaluate JS at the moment, |completion_handler| is
+// called with an NSError.
 void EvaluateJavaScript(WKWebView* web_view,
                         NSString* script,
                         JavaScriptCompletion completion_handler);
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_UI_WEB_VIEW_JS_UTILS_H_