Making sure ClearHandleAfterTap's tap occurs inside of HTML document

The last tap in ClearHandleAfterTap was causing the HitTestResult's innerNode to
be null. This change makes it so that the tap occurs on an HTML element thus
making the innerNode not be null. This is change was necessary to for
crrev.com/2616623002.

Review-Url: https://codereview.chromium.org/2748483002
Cr-Commit-Position: refs/heads/master@{#457488}

third_party/WebKit/Source/core/input/EventHandlerTest.cpp

@@ -368,10 +368,10 @@ TEST_F(EventHandlerTest, NonEmptyTextfieldInsertionOnLongPress) {
 }
 
 TEST_F(EventHandlerTest, ClearHandleAfterTap) {
-  setHtmlInnerHTML("<textarea cols=50 rows=50>Enter text</textarea>");
+  setHtmlInnerHTML("<textarea cols=50  rows=10>Enter text</textarea>");
 
   // Show handle
-  LongPressEventBuilder longPressEvent(IntPoint(200, 200));
+  LongPressEventBuilder longPressEvent(IntPoint(200, 10));
   document().frame()->eventHandler().handleGestureEvent(longPressEvent);
 
   ASSERT_TRUE(
@@ -379,11 +379,9 @@ TEST_F(EventHandlerTest, ClearHandleAfterTap) {
   ASSERT_TRUE(selection().isHandleVisible());
 
   // Tap away from text area should clear handle
-  TapEventBuilder singleTapEvent(IntPoint(700, 700), 1);
+  TapEventBuilder singleTapEvent(IntPoint(200, 350), 1);
   document().frame()->eventHandler().handleGestureEvent(singleTapEvent);
 
-  ASSERT_TRUE(
-      selection().computeVisibleSelectionInDOMTreeDeprecated().isNone());
   ASSERT_FALSE(selection().isHandleVisible());
 }