Remove the check of LocalRootImpl() in HandleInputEvent().

In the function WebFrameWidgetImpl::HandleInputEvent, it looks like not
need to check LocalRootImpl(), this patch removes it.

Change-Id: I13ff011721e748875635b8894a57501a71efeb84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318893Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#792975}

third_party/blink/renderer/core/frame/web_frame_widget_impl.cc

@@ -456,12 +456,10 @@ WebInputEventResult WebFrameWidgetImpl::HandleInputEvent(
   if (!GetPage())
     return WebInputEventResult::kNotHandled;
 
-  if (LocalRootImpl()) {
-    if (WebDevToolsAgentImpl* devtools = LocalRootImpl()->DevToolsAgentImpl()) {
-      auto result = devtools->HandleInputEvent(input_event);
-      if (result != WebInputEventResult::kNotHandled)
-        return result;
-    }
+  if (WebDevToolsAgentImpl* devtools = LocalRootImpl()->DevToolsAgentImpl()) {
+    auto result = devtools->HandleInputEvent(input_event);
+    if (result != WebInputEventResult::kNotHandled)
+      return result;
   }
 
   // Report the event to be NOT processed by WebKit, so that the browser can