[ios] Removed UIWebView JS evaluation code.

BUG=579697

Review URL: https://codereview.chromium.org/1808993002

Cr-Commit-Position: refs/heads/master@{#381743}

ios/web/public/web_state/js/crw_js_injection_evaluator.h

@@ -21,6 +21,7 @@ typedef void (^JavaScriptCompletion)(NSString*, NSError*);
 // with results of the evaluation (which may be nil if the implementing object
 // has no way to run the evaluation or the evaluation returns a nil value)
 // or an NSError if there is an error. The |completionHandler| can be nil.
+// TODO(crbug.com/595761): Change this API to return |id| instead of string.
 - (void)evaluateJavaScript:(NSString*)script
        stringResultHandler:(web::JavaScriptCompletion)handler;
 

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);

ios/web/web_state/ui/web_view_js_utils.mm

@@ -4,17 +4,16 @@
 
 #import "ios/web/web_state/ui/web_view_js_utils.h"
 
-#import <UIKit/UIKit.h>
+#include <CoreFoundation/CoreFoundation.h>
 #import <WebKit/WebKit.h>
 
-#include "base/ios/weak_nsobject.h"
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
 
 namespace {
 
-// Converts result of WKWebView script evaluation to UIWebView format.
-NSString* UIResultFromWKResult(id result) {
+// Converts result of WKWebView script evaluation to a string.
+NSString* StringResultFromWKResult(id result) {
   if (!result)
     return @"";
 
@@ -42,18 +41,6 @@ namespace web {
 
 NSString* const kJSEvaluationErrorDomain = @"JSEvaluationError";
 
-void EvaluateJavaScript(UIWebView* web_view,
-                        NSString* script,
-                        JavaScriptCompletion completion_handler) {
-  base::WeakNSObject<UIWebView> weak_web_view(web_view);
-  dispatch_async(dispatch_get_main_queue(), ^{
-    NSString* result =
-        [weak_web_view stringByEvaluatingJavaScriptFromString:script];
-    if (completion_handler)
-      completion_handler(result, nil);
-  });
-}
-
 void EvaluateJavaScript(WKWebView* web_view,
                         NSString* script,
                         JavaScriptCompletion completion_handler) {
@@ -79,7 +66,7 @@ void EvaluateJavaScript(WKWebView* web_view,
   // need to call those completion handlers.
   if (completion_handler) {
     web_view_completion_handler = ^(id result, NSError* error) {
-      completion_handler(UIResultFromWKResult(result), error);
+      completion_handler(StringResultFromWKResult(result), error);
     };
   }
   [web_view evaluateJavaScript:script