Remove enable-pinch-zoom-scrollbars flag.

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index 48e37a65e0e72bcdd39ce1ee47f1ce6b2f09c9c8..bc502e127ae9cc9631471f00c620f54854061241 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -67,10 +67,6 @@ const char kMaxTilesForInterestArea[] = "max-tiles-for-interest-area";
 const char kMaxUnusedResourceMemoryUsagePercentage[] =
     "max-unused-resource-memory-usage-percentage";
 
-// Causes overlay scrollbars to appear when zoomed in ChromeOS/Windows.
-const char kEnablePinchZoomScrollbars[]     = "enable-pinch-zoom-scrollbars";
-const char kDisablePinchZoomScrollbars[]    = "disable-pinch-zoom-scrollbars";
-
 // Causes the compositor to render to textures which are then sent to the parent
 // through the texture mailbox mechanism.
 // Requires --enable-compositor-frame-message.