Add missing (and remove superfluous) 'explicit' from constructors.

cc/layer_quad.h

 // 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.
 
 
 #ifndef CC_LAYER_QUAD_H_
 #define CC_LAYER_QUAD_H_
 
 #include "cc/cc_export.h"
 #include "ui/gfx/point_f.h"
@@ skipping 60 matching lines @@
                 (x() * e.z() - e.x() * z()) / (e.x() * y() - x() * e.y()));
         }
 
     private:
         float m_x;
         float m_y;
         float m_z;
     };
 
     LayerQuad(const Edge& left, const Edge& top, const Edge& right, const Edge& bottom);
-    LayerQuad(const gfx::QuadF&);
+    explicit LayerQuad(const gfx::QuadF&);
 
     Edge left() const { return m_left; }
     Edge top() const { return m_top; }
     Edge right() const { return m_right; }
     Edge bottom() const { return m_bottom; }
 
     void inflateX(float dx) { m_left.moveZ(dx); m_right.moveZ(dx); }
     void inflateY(float dy) { m_top.moveZ(dy); m_bottom.moveZ(dy); }
     void inflate(float d) { inflateX(d); inflateY(d); }
     void inflateAntiAliasingDistance() { inflate(kAntiAliasingInflateDistance); }
 
     gfx::QuadF ToQuadF() const;
 
     void toFloatArray(float[12]) const;
 
 private:
     Edge m_left;
     Edge m_top;
     Edge m_right;
     Edge m_bottom;
 };
 
 }
 
 #endif  // CC_LAYER_QUAD_H_