Get rid of unused function LayoutBoxModelObject::SetSelectionState()

After we remove LayoutBoxModelObject::SetSelectionState() implementation,
LayoutObject::SetSelectionState() is no longer needed to be virtual
since there are no other calls.
Thus, we can remove |virtual| from LayoutObject::SetSelectionState().

Bug: 739062
Change-Id: I49b1426f9fc89586d1e818b10385c18c5223399e
Reviewed-on: https://chromium-review.googlesource.com/802603
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: yosin (OOO Dec 11 to Jan 8) <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522048}

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp

@@ -78,27 +78,6 @@ typedef HashMap<const LayoutBoxModelObject*, LayoutBoxModelObject*>
     ContinuationMap;
 static ContinuationMap* g_continuation_map = nullptr;
 
-void LayoutBoxModelObject::SetSelectionState(SelectionState state) {
-  if (state == SelectionState::kInside &&
-      GetSelectionState() != SelectionState::kNone)
-    return;
-
-  if ((state == SelectionState::kStart &&
-       GetSelectionState() == SelectionState::kEnd) ||
-      (state == SelectionState::kEnd &&
-       GetSelectionState() == SelectionState::kStart))
-    LayoutObject::SetSelectionState(SelectionState::kStartAndEnd);
-  else
-    LayoutObject::SetSelectionState(state);
-
-  // FIXME: We should consider whether it is OK propagating to ancestor
-  // LayoutInlines. This is a workaround for http://webkit.org/b/32123
-  // The containing block can be null in case of an orphaned tree.
-  LayoutBlock* containing_block = ContainingBlock();
-  if (containing_block && !containing_block->IsLayoutView())
-    containing_block->SetSelectionState(state);
-}
-
 void LayoutBoxModelObject::ContentChanged(ContentChangeType change_type) {
   if (!HasLayer())
     return;

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h

@@ -418,8 +418,6 @@ class CORE_EXPORT LayoutBoxModelObject : public LayoutObject {
       const LayoutBoxModelObject* ancestor_to_stop_at,
       LayoutGeometryMap&) const override;
 
-  void SetSelectionState(SelectionState) override;
-
   void ContentChanged(ContentChangeType);
   bool HasAcceleratedCompositing() const;
 

third_party/WebKit/Source/core/layout/LayoutObject.h

@@ -1484,7 +1484,7 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
   SelectionState GetSelectionState() const {
     return bitfields_.GetSelectionState();
   }
-  virtual void SetSelectionState(SelectionState state) {
+  void SetSelectionState(SelectionState state) {
     bitfields_.SetSelectionState(state);
   }
   bool CanUpdateSelectionOnRootLineBoxes() const;

third_party/WebKit/Source/core/layout/LayoutText.cpp

@@ -1444,15 +1444,6 @@ float LayoutText::FirstRunY() const {
   return first_text_box_ ? first_text_box_->Y().ToFloat() : 0;
 }
 
-void LayoutText::SetSelectionState(SelectionState state) {
-  LayoutObject::SetSelectionState(state);
-
-  // The containing block can be null in case of an orphaned tree.
-  LayoutBlock* containing_block = ContainingBlock();
-  if (containing_block && !containing_block->IsLayoutView())
-    containing_block->SetSelectionState(state);
-}
-
 void LayoutText::SetTextWithOffset(scoped_refptr<StringImpl> text,
                                    unsigned offset,
                                    unsigned len,

third_party/WebKit/Source/core/layout/LayoutText.h

@@ -189,7 +189,6 @@ class CORE_EXPORT LayoutText : public LayoutObject {
 
   virtual void TransformText();
 
-  void SetSelectionState(SelectionState) final;
   LayoutRect LocalSelectionRect() const final;
   LayoutRect LocalCaretRect(
       const InlineBox*,