Revert of Remove the is_loading_ field from WebContentsImpl

content/test/test_web_contents.cc

Index: content/test/test_web_contents.cc
diff --git a/content/test/test_web_contents.cc b/content/test/test_web_contents.cc
index d2c7243c9faff83c1a5949b564253d6d9aa7ea9b..d712e5ff8ff85bc3a4c1e113feaf015d6e6e7dfb 100644
--- a/content/test/test_web_contents.cc
+++ b/content/test/test_web_contents.cc
@@ -189,29 +189,7 @@
 }
 
 void TestWebContents::TestSetIsLoading(bool value) {
-  if (value)
-    DidStartLoading(GetMainFrame()->frame_tree_node(), true);
-  else {
-    for (FrameTreeNode* node : frame_tree_.Nodes()) {
-      RenderFrameHostImpl* current_frame_host =
-          node->render_manager()->current_frame_host();
-      DCHECK(current_frame_host);
-      current_frame_host->ResetLoadingState();
-
-      RenderFrameHostImpl* pending_frame_host =
-          node->render_manager()->pending_frame_host();
-
-      if (IsBrowserSideNavigationEnabled()) {
-        RenderFrameHostImpl* speculative_frame_host =
-            node->render_manager()->speculative_frame_host();
-        if (speculative_frame_host)
-          speculative_frame_host->ResetLoadingState();
-      } else {
-        if (pending_frame_host)
-          pending_frame_host->ResetLoadingState();
-      }
-    }
-  }
+  SetIsLoading(value, true, nullptr);
 }
 
 void TestWebContents::CommitPendingNavigation() {