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

cc/layer_tree_host_impl.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_TREE_HOST_IMPL_H_
 #define CC_LAYER_TREE_HOST_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
@@ skipping 259 matching lines @@
     public:
         bool shouldRemoveRenderPass(const RenderPassDrawQuad&, const FrameData&) const;
 
         // Iterates from the root first, in order to remove the surfaces closest
         // to the root with cached textures, and all surfaces that draw into
         // them.
         size_t renderPassListBegin(const RenderPassList& list) const { return list.size() - 1; }
         size_t renderPassListEnd(const RenderPassList&) const { return 0 - 1; }
         size_t renderPassListNext(size_t it) const { return it - 1; }
 
-        CullRenderPassesWithCachedTextures(Renderer& renderer) : m_renderer(renderer) { }
+        explicit CullRenderPassesWithCachedTextures(Renderer& renderer) : m_renderer(renderer) { }
     private:
         Renderer& m_renderer;
     };
 
     class CC_EXPORT CullRenderPassesWithNoQuads {
     public:
         bool shouldRemoveRenderPass(const RenderPassDrawQuad&, const FrameData&) const;
 
         // Iterates in draw order, so that when a surface is removed, and its
         // target becomes empty, then its target can be removed also.
@@ skipping 99 matching lines @@
     size_t m_lastSentMemoryUseBytes;
 
     scoped_ptr<AnimationRegistrar> m_animationRegistrar;
 
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYER_TREE_HOST_IMPL_H_