Convert USERSELECT_ALL to a runtime enabled feature.

Source/core/editing/FrameSelection.cpp

Index: Source/core/editing/FrameSelection.cpp
diff --git a/Source/core/editing/FrameSelection.cpp b/Source/core/editing/FrameSelection.cpp
index f569c89dd61fed3d4ebcf390d5bd4fdd114e5b25..6c697f8184e9e59a7d8012d789043b7d5f29e616 100644
--- a/Source/core/editing/FrameSelection.cpp
+++ b/Source/core/editing/FrameSelection.cpp
@@ -557,13 +557,11 @@ VisiblePosition FrameSelection::nextWordPositionForPlatform(const VisiblePositio
     return positionAfterCurrentWord;
 }
 
-#if ENABLE(USERSELECT_ALL)
 static void adjustPositionForUserSelectAll(VisiblePosition& pos, bool isForward)
 {
     if (Node* rootUserSelectAll = Position::rootUserSelectAllForNode(pos.deepEquivalent().anchorNode()))
         pos = isForward ? positionAfterNode(rootUserSelectAll).downstream(CanCrossEditingBoundary) : positionBeforeNode(rootUserSelectAll).upstream(CanCrossEditingBoundary);
 }
-#endif
 
 VisiblePosition FrameSelection::modifyExtendingRight(TextGranularity granularity)
 {
@@ -603,9 +601,7 @@ VisiblePosition FrameSelection::modifyExtendingRight(TextGranularity granularity
         pos = modifyExtendingForward(granularity);
         break;
     }
-#if ENABLE(USERSELECT_ALL)
     adjustPositionForUserSelectAll(pos, directionOfEnclosingBlock() == LTR);
-#endif
     return pos;
 }
 
@@ -645,9 +641,7 @@ VisiblePosition FrameSelection::modifyExtendingForward(TextGranularity granulari
             pos = endOfDocument(pos);
         break;
     }
-#if ENABLE(USERSELECT_ALL)
-     adjustPositionForUserSelectAll(pos, directionOfEnclosingBlock() == LTR);
-#endif
+    adjustPositionForUserSelectAll(pos, directionOfEnclosingBlock() == LTR);
     return pos;
 }
 
@@ -770,9 +764,7 @@ VisiblePosition FrameSelection::modifyExtendingLeft(TextGranularity granularity)
         pos = modifyExtendingBackward(granularity);
         break;
     }
-#if ENABLE(USERSELECT_ALL)
     adjustPositionForUserSelectAll(pos, !(directionOfEnclosingBlock() == LTR));
-#endif
     return pos;
 }
 
@@ -817,9 +809,7 @@ VisiblePosition FrameSelection::modifyExtendingBackward(TextGranularity granular
             pos = startOfDocument(pos);
         break;
     }
-#if ENABLE(USERSELECT_ALL)
     adjustPositionForUserSelectAll(pos, !(directionOfEnclosingBlock() == LTR));
-#endif
     return pos;
 }