Delete blink code for scroll-blocks-on

Source/platform/graphics/CompositingReasons.h

Index: Source/platform/graphics/CompositingReasons.h
diff --git a/Source/platform/graphics/CompositingReasons.h b/Source/platform/graphics/CompositingReasons.h
index 22ffe907c0b64b0645f45f6b1c04db3d27442b7a..a31c94ef7d392fefe8862208d8f99515140ad3fa 100644
--- a/Source/platform/graphics/CompositingReasons.h
+++ b/Source/platform/graphics/CompositingReasons.h
@@ -29,7 +29,6 @@ const uint64_t CompositingReasonOverflowScrollingParent                  = UINT6
 const uint64_t CompositingReasonOutOfFlowClipping                        = UINT64_C(1) << 11;
 const uint64_t CompositingReasonVideoOverlay                             = UINT64_C(1) << 12;
 const uint64_t CompositingReasonWillChangeCompositingHint                = UINT64_C(1) << 13;
-const uint64_t CompositingReasonScrollBlocksOn                           = UINT64_C(1) << 14;

[dtapuska, 2015/08/11 17:15:11]

When reasons have been removed in the past; the entire enum is reordered so
there is no gap. 

[Rick Byers, 2015/08/12 02:20:29]

Ah yes, thanks.  Done.

 
 // Overlap reasons that require knowing what's behind you in paint-order before knowing the answer
 const uint64_t CompositingReasonAssumedOverlap                           = UINT64_C(1) << 15;
@@ -107,7 +106,6 @@ const uint64_t CompositingReasonComboAllDirectReasons =
     | CompositingReasonOutOfFlowClipping
     | CompositingReasonVideoOverlay
     | CompositingReasonWillChangeCompositingHint
-    | CompositingReasonScrollBlocksOn
     | CompositingReasonCompositorProxy;
 
 const uint64_t CompositingReasonComboAllDirectStyleDeterminedReasons =
@@ -116,7 +114,6 @@ const uint64_t CompositingReasonComboAllDirectStyleDeterminedReasons =
     | CompositingReasonActiveAnimation
     | CompositingReasonTransitionProperty
     | CompositingReasonWillChangeCompositingHint
-    | CompositingReasonScrollBlocksOn
     | CompositingReasonCompositorProxy;
 
 const uint64_t CompositingReasonComboCompositedDescendants =