Remove RequestTracker from WebStateImpl.

ios/web/webui/crw_web_ui_manager.mm

Index: ios/web/webui/crw_web_ui_manager.mm
diff --git a/ios/web/webui/crw_web_ui_manager.mm b/ios/web/webui/crw_web_ui_manager.mm
index 2efc12b796a6cf8ffb054b1564144422b28cf330..a456bc9b3f71f115905d3f731c4c6e367a3821d5 100644
--- a/ios/web/webui/crw_web_ui_manager.mm
+++ b/ios/web/webui/crw_web_ui_manager.mm
@@ -113,21 +113,16 @@ const char kScriptCommandPrefix[] = "webui";
   if (!web::GetWebClient()->IsAppSpecificURL(URL))
     return;
 
-  GURL navigationURL(URL);
-  // Add request group ID to the URL, if not present. Request group ID may
-  // already be added if restoring state to a WebUI page.
-  GURL requestURL =
-      web::ExtractRequestGroupIDFromURL(net::NSURLWithGURL(URL))
-          ? URL
-          : net::GURLWithNSURL(web::AddRequestGroupIDToURL(
-                net::NSURLWithGURL(URL), _webState->GetRequestGroupID()));
+  // Copy |URL| as it is passed by reference which does not work correctly
+  // with blocks (if the object is destroyed the block will have a dangling
+  // reference).
+  GURL copyURL(URL);
   base::WeakNSObject<CRWWebUIManager> weakSelf(self);
-  [self loadWebUIPageForURL:requestURL
+  [self loadWebUIPageForURL:copyURL
           completionHandler:^(NSString* HTML) {
             web::WebStateImpl* webState = [weakSelf webState];
             if (webState) {
-              webState->LoadWebUIHtml(base::SysNSStringToUTF16(HTML),
-                                      navigationURL);
+              webState->LoadWebUIHtml(base::SysNSStringToUTF16(HTML), copyURL);
             }
           }];
 }