Address comments in the orignial CL

ash/display/display_util.h

 // Copyright 2014 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 ASH_DISPLAY_DISPLAY_UTIL_H_
 #define ASH_DISPLAY_DISPLAY_UTIL_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 45 matching lines @@
                                                 DisplayMode* out);
 
 // Sets the UI scale for the |display_id|. Returns false if the
 // display_id is not an internal display.
 ASH_EXPORT bool SetDisplayUIScale(int64_t display_id, float scale);
 
 // Tests if the |info| has display mode that matches |ui_scale|.
 bool HasDisplayModeForUIScale(const DisplayInfo& info, float ui_scale);
 
 // Computes the bounds that defines the bounds between two displays.
-// Returns false if two displays does not intersect.
+// Returns false if two displays do not intersect.
 bool ComputeBoundary(const gfx::Display& primary_display,
                      const gfx::Display& secondary_display,
                      gfx::Rect* primary_edge_in_screen,
                      gfx::Rect* secondary_edge_in_screen);
 
 // Creates edge bounds from |bounds_in_screen| that fits the edge
 // of the native window for |ash_host|.
 ASH_EXPORT gfx::Rect GetNativeEdgeBounds(AshWindowTreeHost* ash_host,
                                          const gfx::Rect& bounds_in_screen);
 
@@ skipping 40 matching lines @@
 ASH_EXPORT std::string DisplayIdListToString(const DisplayIdList& list);
 
 // Returns true if one of following conditinos is met.
 // 1) id1 is internal.
 // 2) output index of id1 < output index of id2 and id2 isn't internal.
 ASH_EXPORT bool CompareDisplayIds(int64_t id1, int64_t id2);
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_UTIL_H_