Remove DCHECK_IMPLIES and CHECK_IMPLIES

cc/tiles/picture_layer_tiling.cc

 // Copyright 2012 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/tiles/picture_layer_tiling.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <set>
@@ skipping 238 matching lines @@
   if (after_bottom > before_bottom) {
     DCHECK_EQ(after_bottom, before_bottom + 1);
     for (int i = before_left; i <= before_right; ++i) {
       if (ShouldCreateTileAt(i, after_bottom))
         CreateTile(i, after_bottom);
     }
   }
 }
 
 void PictureLayerTiling::Invalidate(const Region& layer_invalidation) {
-  DCHECK_IMPLIES(tree_ == ACTIVE_TREE,
-                 !client_->GetPendingOrActiveTwinTiling(this));
+  DCHECK(tree_ != ACTIVE_TREE || !client_->GetPendingOrActiveTwinTiling(this));
   RemoveTilesInRegion(layer_invalidation, true /* recreate tiles */);
 }
 
 void PictureLayerTiling::RemoveTilesInRegion(const Region& layer_invalidation,
                                              bool recreate_tiles) {
   // We only invalidate the active tiling when it's orphaned: it has no pending
   // twin, so it's slated for removal in the future.
   if (live_tiles_rect_.IsEmpty())
     return;
   // Pick 16 for the size of the SmallMap before it promotes to a hash_map.
@@ skipping 840 matching lines @@
       break;
   }
 
   gfx::Rect result(origin_x, origin_y, width, height);
   if (cache)
     cache->previous_result = result;
   return result;
 }
 
 }  // namespace cc