cc: Remove an unused constructor from TilePriority

cc/resources/tile_priority.h

 // 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.
 
 #ifndef CC_RESOURCES_TILE_PRIORITY_H_
 #define CC_RESOURCES_TILE_PRIORITY_H_
 
 #include <algorithm>
 #include <limits>
 #include <string>
@@ skipping 33 matching lines @@
         priority_bin(EVENTUALLY),
         distance_to_visible(std::numeric_limits<float>::infinity()) {}
 
   TilePriority(TileResolution resolution,
                PriorityBin bin,
                float distance_to_visible)
       : resolution(resolution),
         priority_bin(bin),
         distance_to_visible(distance_to_visible) {}
 
-  TilePriority(const TilePriority& active, const TilePriority& pending) {
-    if (active.resolution == HIGH_RESOLUTION ||
-        pending.resolution == HIGH_RESOLUTION)
-      resolution = HIGH_RESOLUTION;
-    else if (active.resolution == LOW_RESOLUTION ||
-             pending.resolution == LOW_RESOLUTION)
-      resolution = LOW_RESOLUTION;
-    else
-      resolution = NON_IDEAL_RESOLUTION;
-
-    if (active.priority_bin < pending.priority_bin) {
-      priority_bin = active.priority_bin;
-      distance_to_visible = active.distance_to_visible;
-    } else if (active.priority_bin > pending.priority_bin) {
-      priority_bin = pending.priority_bin;
-      distance_to_visible = pending.distance_to_visible;
-    } else {
-      priority_bin = active.priority_bin;
-      distance_to_visible =
-          std::min(active.distance_to_visible, pending.distance_to_visible);
-    }
-  }
-
   void AsValueInto(base::trace_event::TracedValue* dict) const;
 
-  bool operator ==(const TilePriority& other) const {
-    return resolution == other.resolution &&
-           priority_bin == other.priority_bin &&
-           distance_to_visible == other.distance_to_visible;
-  }
-
-  bool operator !=(const TilePriority& other) const {
-    return !(*this == other);
-  }
-
   bool IsHigherPriorityThan(const TilePriority& other) const {
     return priority_bin < other.priority_bin ||
            (priority_bin == other.priority_bin &&
             distance_to_visible < other.distance_to_visible);
   }
 
   TileResolution resolution;
   PriorityBin priority_bin;
   float distance_to_visible;
 };
@@ skipping 51 matching lines @@
   bool operator!=(const GlobalStateThatImpactsTilePriority& other) const {
     return !(*this == other);
   }
 
   void AsValueInto(base::trace_event::TracedValue* dict) const;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_PRIORITY_H_