Extend the ToRenderFrameHost magic to FrameTreeNode* and Shell*

content/browser/renderer_host/input/touch_action_browsertest.cc

Index: content/browser/renderer_host/input/touch_action_browsertest.cc
diff --git a/content/browser/renderer_host/input/touch_action_browsertest.cc b/content/browser/renderer_host/input/touch_action_browsertest.cc
index 2c4ab954bec817dc1ea7cf00622a1360a948f9c4..ae377fd8f99da8c346c5efa4636d556c220f9436 100644
--- a/content/browser/renderer_host/input/touch_action_browsertest.cc
+++ b/content/browser/renderer_host/input/touch_action_browsertest.cc
@@ -120,9 +120,7 @@ class TouchActionBrowserTest : public ContentBrowserTest {
   int ExecuteScriptAndExtractInt(const std::string& script) {
     int value = 0;
     EXPECT_TRUE(content::ExecuteScriptAndExtractInt(
-        shell()->web_contents(),
-        "domAutomationController.send(" + script + ")",
-        &value));
+        shell(), "domAutomationController.send(" + script + ")", &value));
     return value;
   }