Reland: Remove DCHECK_IMPLIES/CHECK_IMPLIES.

cc/input/top_controls_manager.cc

 // Copyright 2013 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/input/top_controls_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "cc/animation/keyframed_animation_curve.h"
@@ skipping 158 matching lines @@
   return scroll_delta;
 }
 
 void TopControlsManager::ResetAnimations() {
   top_controls_animation_ = nullptr;
   animation_direction_ = NO_ANIMATION;
 }
 
 void TopControlsManager::SetupAnimation(AnimationDirection direction) {
   DCHECK_NE(NO_ANIMATION, direction);
-  DCHECK_IMPLIES(direction == HIDING_CONTROLS, TopControlsShownRatio() > 0.f);
-  DCHECK_IMPLIES(direction == SHOWING_CONTROLS, TopControlsShownRatio() < 1.f);
+  DCHECK(direction != HIDING_CONTROLS || TopControlsShownRatio() > 0.f);
+  DCHECK(direction != SHOWING_CONTROLS || TopControlsShownRatio() < 1.f);
 
   if (top_controls_animation_ && animation_direction_ == direction)
     return;
 
   if (!TopControlsHeight()) {
     client_->SetCurrentTopControlsShownRatio(
         direction == HIDING_CONTROLS ? 0.f : 1.f);
     return;
   }
 
@@ skipping 42 matching lines @@
   }
   return false;
 }
 
 void TopControlsManager::ResetBaseline() {
   accumulated_scroll_delta_ = 0.f;
   baseline_content_offset_ = ContentTopOffset();
 }
 
 }  // namespace cc