Fix compile failure on Mac and Linux for build 57.0.2987.42

content/browser/renderer_host/input/touch_event_queue.cc

Index: content/browser/renderer_host/input/touch_event_queue.cc
diff --git a/content/browser/renderer_host/input/touch_event_queue.cc b/content/browser/renderer_host/input/touch_event_queue.cc
index f849b0ecdbd6bb6320cf9dd83dd100ad42b87bd3..d0932e6e33939724050c7e5966b84c04e1ab2217 100644
--- a/content/browser/renderer_host/input/touch_event_queue.cc
+++ b/content/browser/renderer_host/input/touch_event_queue.cc
@@ -28,10 +28,6 @@ namespace {
 // scrolling is active and possible.
 const double kAsyncTouchMoveIntervalSec = .2;
 
-// A sanity check on touches received to ensure that touch movement outside
-// the platform slop region will cause scrolling.
-const double kMaxConceivablePlatformSlopRegionLengthDipsSquared = 60. * 60.;
-
 TouchEventWithLatencyInfo ObtainCancelEventForTouchEvent(
     const TouchEventWithLatencyInfo& event_to_cancel) {
   TouchEventWithLatencyInfo event = event_to_cancel;