Fixed the issue of insertion handle not clearing on single tap on empty field.

content/browser/renderer_host/input/touch_selection_controller.cc

 // Copyright 2014 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 "content/browser/renderer_host/input/touch_selection_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
@@ skipping 122 matching lines @@
   ShowSelectionHandlesAutomatically();
   ShowInsertionHandleAutomatically();
   ResetCachedValuesIfInactive();
 }
 
 void TouchSelectionController::OnTapEvent() {
   response_pending_input_event_ = TAP;
   activate_selection_automatically_ = false;
   DeactivateSelection();
   ShowInsertionHandleAutomatically();
+  if (selection_empty_)
+    DeactivateInsertion();
   ResetCachedValuesIfInactive();
 }
 
 void TouchSelectionController::HideAndDisallowShowingAutomatically() {
   response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
   DeactivateInsertion();
   DeactivateSelection();
   activate_insertion_automatically_ = false;
   activate_selection_automatically_ = false;
 }
@@ skipping 240 matching lines @@
 }
 
 TouchHandle::AnimationStyle TouchSelectionController::GetAnimationStyle(
     bool was_active) const {
   return was_active && client_->SupportsAnimation()
              ? TouchHandle::ANIMATION_SMOOTH
              : TouchHandle::ANIMATION_NONE;
 }
 
 }  // namespace content