Remove flag to disable cc touch hit testing.

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index 4211a35d7965c82de64fc7de6b33a5e7ae531fa2..13904cdba36c95d2c2f8cbec822a721a727f1817 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -120,9 +120,5 @@ const char kCCLayerTreeTestNoTimeout[] = "cc-layer-tree-test-no-timeout";
 // Makes pixel tests write their output instead of read it.
 const char kCCRebaselinePixeltests[] = "cc-rebaseline-pixeltests";
 
-// Disable touch hit testing in the compositor.
-const char kDisableCompositorTouchHitTesting[] =
-    "disable-compositor-touch-hit-testing";
-
 }  // namespace switches
 }  // namespace cc