update comment in GetWebViewConfiguration

update comment in

it returns a shallow copy of the configuration.

WKWebViewConfigurationProvider: :GetWebViewConfiguration to indicate that
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I85286fec068683ebe923e53d3e39b7d852abf281
Reviewed-on: https://chromium-review.googlesource.com/956693Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542159}

ios/web/web_state/ui/wk_web_view_configuration_provider.h

@@ -28,9 +28,10 @@ class WKWebViewConfigurationProvider : public base::SupportsUserData::Data {
   static web::WKWebViewConfigurationProvider& FromBrowserState(
       web::BrowserState* browser_state);
 
-  // Returns an autoreleased copy of WKWebViewConfiguration associated with
-  // browser state. Lazily creates the config. Configuration's |preferences|
-  // will have scriptCanOpenWindowsAutomatically property set to YES.
+  // Returns an autoreleased shallow copy of WKWebViewConfiguration associated
+  // with browser state. Lazily creates the config. Configuration's
+  // |preferences| will have scriptCanOpenWindowsAutomatically property set to
+  // YES.
   // Must be used instead of [[WKWebViewConfiguration alloc] init].
   // Callers must not retain the returned object.
   WKWebViewConfiguration* GetWebViewConfiguration();

ios/web/web_state/ui/wk_web_view_configuration_provider.mm

@@ -101,7 +101,8 @@ WKWebViewConfigurationProvider::GetWebViewConfiguration() {
     [[configuration_ userContentController]
         addUserScript:InternalGetDocumentEndScriptForAllFrames(browser_state_)];
   }
-  // Prevent callers from changing the internals of configuration.
+  // This is a shallow copy to prevent callers from changing the internals of
+  // configuration.
   return [configuration_ copy];
 }