[ios] Removed UIWebView JS evaluation code.

ios/web/web_state/ui/web_view_js_utils.h

Index: ios/web/web_state/ui/web_view_js_utils.h
diff --git a/ios/web/web_state/ui/web_view_js_utils.h b/ios/web/web_state/ui/web_view_js_utils.h
index 37d8be31f10a5df05abcb0d6c638c3afdbf01ffa..e1dec69898a66737464909119da77c7f0420e490 100644
--- a/ios/web/web_state/ui/web_view_js_utils.h
+++ b/ios/web/web_state/ui/web_view_js_utils.h
@@ -9,13 +9,8 @@
 
 #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.
@@ -27,18 +22,9 @@ enum JSEvaluationErrorCode {
   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);