Make DragController to use VisibleSelection::toNormalizedEphemeralRange()...

Make DragController to use VisibleSelection::toNormalizedEphemeralRange() instead of toNormalizedRange()

This patch changes |DragController| class to use |toNormalizedEphemeralRange()|
in |VisibleSelection| class instead of |toNormalizedRange()| as a preparation
of templatizing |VisibleSelection| to use templatized positions instead of
DOM position to represent range.

This patch is a preparation of making selection to handle granularity for web
component, http://crrev.com/1277863002

BUG=513568
TEST=n/a; no behavior changes

Review URL: https://codereview.chromium.org/1316603002

git-svn-id: svn://svn.chromium.org/blink/trunk@201115 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/page/DragController.cpp

@@ -430,7 +430,7 @@ static bool setSelectionToDragCaret(LocalFrame* frame, VisibleSelection& dragCar
     if (frame->selection().isNone()) {
         dragCaret = VisibleSelection(frame->positionForPoint(point));
         frame->selection().setSelection(dragCaret);
-        range = dragCaret.toNormalizedRange();
+        range = createRange(dragCaret.toNormalizedEphemeralRange());
     }
     return !frame->selection().isNone() && frame->selection().isContentEditable();
 }
@@ -483,7 +483,7 @@ bool DragController::concludeEditDrag(DragData* dragData)
 
     VisibleSelection dragCaret(m_page->dragCaretController().caretPosition());
     m_page->dragCaretController().clear();
-    RefPtrWillBeRawPtr<Range> range = dragCaret.toNormalizedRange();
+    RefPtrWillBeRawPtr<Range> range = createRange(dragCaret.toNormalizedEphemeralRange());
     RefPtrWillBeRawPtr<Element> rootEditableElement = innerFrame->selection().rootEditableElement();
 
     // For range to be null a WebKit client must have done something bad while