Re-introduce printers for Node, Position, PositionAnchorType in GTest

Source/core/input/EventHandlerTest.cpp

 // Copyright 2015 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 "config.h"
 #include "core/input/EventHandler.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Range.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLDocument.h"
 #include "core/page/AutoscrollController.h"
 #include "core/page/Page.h"
-#include "core/testing/CoreTestHelpers.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/PlatformMouseEvent.h"
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class EventHandlerTest : public ::testing::Test {
 protected:
     void SetUp() override;
 
@@ skipping 64 matching lines @@
     document().frame()->eventHandler().handleMouseReleaseEvent(mouseUpEvent);
 
     FrameSelection& selection = document().frame()->selection();
     ASSERT_TRUE(selection.isRange());
     RefPtrWillBeRawPtr<Range> range = createRange(selection.selection().toNormalizedEphemeralRange());
     ASSERT_TRUE(range.get());
     EXPECT_EQ("Line 1\nLine 2", range->text());
 }
 
 } // namespace blink