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

content/browser/renderer_host/input/touch_selection_controller_unittest.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 "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/test/mock_motion_event.h"
 
 using ui::test::MockMotionEvent;
@@ skipping 238 matching lines @@
   controller().HideAndDisallowShowingAutomatically();
   EXPECT_EQ(INSERTION_CLEARED, GetLastEventType());
 
   // Long-pressing should show the handle even if the editable region is empty.
   insertion_rect.Offset(2, -2);
   controller().OnLongPressEvent();
   controller().OnSelectionEmpty(true);
   ChangeInsertion(insertion_rect, visible);
   EXPECT_EQ(INSERTION_SHOWN, GetLastEventType());
   EXPECT_EQ(insertion_rect.bottom_left(), GetLastEventAnchor());
+
+  // Single Tap on an empty edit field should clear insertion handle.
+  controller().OnTapEvent();
+  EXPECT_EQ(INSERTION_CLEARED, GetLastEventType());
 }
 
 TEST_F(TouchSelectionControllerTest, InsertionAppearsAfterTapFollowingTyping) {
   gfx::RectF insertion_rect(5, 5, 0, 10);
   bool visible = true;
 
   // Simulate the user tapping an empty text field.
   controller().OnTapEvent();
   controller().OnSelectionEditable(true);
   controller().OnSelectionEmpty(true);
@@ skipping 373 matching lines @@
 
   visible = true;
   ChangeInsertion(insertion_rect, visible);
   EXPECT_FALSE(GetAndResetNeedsAnimate());
 
   controller().SetTemporarilyHidden(false);
   EXPECT_TRUE(GetAndResetNeedsAnimate());
 }
 
 }  // namespace content