cc: remove jank instead of checkerboard setting

cc/layer_tree_host_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 424 matching lines @@
 
                 targetRenderPass->appendQuadsForLayer(*it, &occlusionTracker, appendQuadsData);
             }
         }
 
         if (appendQuadsData.hadOcclusionFromOutsideTargetSurface)
             targetRenderPass->setHasOcclusionFromOutsideTargetSurface(true);
 
         if (appendQuadsData.hadMissingTiles) {
             bool layerHasAnimatingTransform = it->screenSpaceTransformIsAnimating() || it->drawTransformIsAnimating();
-            if (layerHasAnimatingTransform || Settings::jankInsteadOfCheckerboard())
+            if (layerHasAnimatingTransform)
                 drawFrame = false;
         }
 
         occlusionTracker.leaveLayer(it);
     }
 
 #ifndef NDEBUG
     for (size_t i = 0; i < frame.renderPasses.size(); ++i) {
       for (size_t j = 0; j < frame.renderPasses[i]->quadList().size(); ++j)
         DCHECK(frame.renderPasses[i]->quadList()[j]->sharedQuadStateId() >= 0);
@@ skipping 1032 matching lines @@
     ScrollbarAnimationController* scrollbarController = layer->scrollbarAnimationController();
     double monotonicTime = (time - base::TimeTicks()).InSecondsF();
     if (scrollbarController && scrollbarController->animate(monotonicTime))
         m_client->setNeedsRedrawOnImplThread();
 
     for (size_t i = 0; i < layer->children().size(); ++i)
         animateScrollbarsRecursive(layer->children()[i], time);
 }
 
 }  // namespace cc