[Reland] Refactor the selection code in EventHandler

Source/core/html/HTMLLabelElement.cpp

Index: Source/core/html/HTMLLabelElement.cpp
diff --git a/Source/core/html/HTMLLabelElement.cpp b/Source/core/html/HTMLLabelElement.cpp
index 9ce04c8d5470991d0dcbec260154991a8beb3fef..90efefc4cf7d73f08efd4f757ee281f467901c47 100644
--- a/Source/core/html/HTMLLabelElement.cpp
+++ b/Source/core/html/HTMLLabelElement.cpp
@@ -29,6 +29,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/editing/FrameSelection.h"
+#include "core/editing/SelectionController.h"
 #include "core/events/MouseEvent.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/FormAssociatedElement.h"
@@ -160,7 +161,7 @@ void HTMLLabelElement::defaultEventHandler(Event* evt)
             if (LocalFrame* frame = document().frame()) {
                 // Check if there is a selection and click is not on the
                 // selection.
-                if (!Position::nodeIsUserSelectNone(this) && frame->selection().isRange() && !frame->eventHandler().mouseDownWasSingleClickInSelection())
+                if (!Position::nodeIsUserSelectNone(this) && frame->selection().isRange() && !frame->eventHandler().selectionController().mouseDownWasSingleClickInSelection())
                     isLabelTextSelected = true;
                 // If selection is there and is single click i.e. text is
                 // selected by dragging over label text, then return.