Use const ref for LocalFrame::LocalFrameRoot and FrameTree::Top

third_party/WebKit/Source/web/tests/LinkSelectionTest.cpp

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/Range.h"
 #include "core/frame/FrameView.h"
 #include "core/input/EventHandler.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/ContextMenuController.h"
 #include "core/page/FocusController.h"
@@ skipping 157 matching lines @@
   EmulateMouseDrag(left_point_in_link_, right_point_in_link_,
                    WebInputEvent::kAltKey);
   EXPECT_EQ("to select", GetSelectionText());
 }
 
 TEST_F(LinkSelectionTest, HandCursorDuringLinkDrag) {
   EmulateMouseDrag(right_point_in_link_, left_point_in_link_, 0,
                    kSendDownEvent);
   main_frame_->GetFrame()
       ->LocalFrameRoot()
-      ->GetEventHandler()
+      .GetEventHandler()
       .ScheduleCursorUpdate();
   testing::RunDelayedTasks(50);
   const auto& cursor =
       main_frame_->GetFrame()->GetChromeClient().LastSetCursorForTesting();
   EXPECT_EQ(Cursor::kHand, cursor.GetType());
 }
 
 TEST_F(LinkSelectionTest, CaretCursorOverLinkDuringSelection) {
   EmulateMouseDrag(right_point_in_link_, left_point_in_link_,
                    WebInputEvent::kAltKey, kSendDownEvent);
   main_frame_->GetFrame()
       ->LocalFrameRoot()
-      ->GetEventHandler()
+      .GetEventHandler()
       .ScheduleCursorUpdate();
   testing::RunDelayedTasks(50);
   const auto& cursor =
       main_frame_->GetFrame()->GetChromeClient().LastSetCursorForTesting();
   EXPECT_EQ(Cursor::kIBeam, cursor.GetType());
 }
 
 TEST_F(LinkSelectionTest, HandCursorOverLinkAfterContextMenu) {
   // Move mouse.
   EmulateMouseDrag(right_point_in_link_, left_point_in_link_, 0, 0);
 
   // Show context menu. We don't send mouseup event here since in browser it
   // doesn't reach blink because of shown context menu.
   EmulateMouseDown(left_point_in_link_, WebMouseEvent::Button::kRight, 0, 1);
 
   LocalFrame* frame = main_frame_->GetFrame();
   // Hide context menu.
   frame->GetPage()->GetContextMenuController().ClearContextMenu();
 
-  frame->LocalFrameRoot()->GetEventHandler().ScheduleCursorUpdate();
+  frame->LocalFrameRoot().GetEventHandler().ScheduleCursorUpdate();
   testing::RunDelayedTasks(50);
   const auto& cursor =
       main_frame_->GetFrame()->GetChromeClient().LastSetCursorForTesting();
   EXPECT_EQ(Cursor::kHand, cursor.GetType());
 }
 
 TEST_F(LinkSelectionTest, SingleClickWithAltStartsDownload) {
   EXPECT_CALL(
       test_frame_client_,
       LoadURLExternally(_, WebNavigationPolicy::kWebNavigationPolicyDownload,
@@ skipping 109 matching lines @@
     CheckMouseClicks(*element, false);
   }
 
   {
     SCOPED_TRACE("Text div, double click");
     CheckMouseClicks(*element, true);
   }
 }
 
 }  // namespace blink