WebUI: Auto-generate grd entries for ui/webui/resources/js/ios/.

Bug: 1132403
Change-Id: Ice9c1a005017378b0e215c19cec44aa8e2868630
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595516Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837995}

ui/webui/resources/js/BUILD.gn

@@ -70,6 +70,13 @@ preprocess_if_expr("preprocess_src") {
       "web_ui_listener_behavior.js",
     ]
   }
+
+  if (is_ios) {
+    in_files += [
+      "ios/mojo_api.js",
+      "ios/web_ui.js",
+    ]
+  }
 }
 
 preprocess_if_expr("preprocess_generated") {

ui/webui/resources/webui_resources.grd

@@ -44,13 +44,6 @@ without changes to the corresponding grd file. -->
                    use_base_dir="false" />
       </if>
 
-      <if expr="is_ios">
-        <structure name="IDR_WEBUI_JS_IOS_WEB_UI"
-                   file="js/ios/web_ui.js" type="chrome_html" />
-        <structure name="IDR_WEBUI_JS_IOS_MOJO_API"
-                   file="js/ios/mojo_api.js" type="chrome_html" />
-      </if>
-
       <if expr="not is_android and not is_ios">
         <structure name="IDR_LOTTIE_LOTTIE_WORKER_MIN_JS"
                    file="../../../third_party/lottie/lottie_worker.min.js"