cc: Remove redundant is_overlay arguments

cc/resources/texture_mailbox.h

Index: cc/resources/texture_mailbox.h
diff --git a/cc/resources/texture_mailbox.h b/cc/resources/texture_mailbox.h
index 47e71acb199227a06375015e5955cbffe38e9685..7e7e078512eb4b32e4726736639e9d0ed04462dd 100644
--- a/cc/resources/texture_mailbox.h
+++ b/cc/resources/texture_mailbox.h
@@ -26,7 +26,7 @@ class CC_EXPORT TextureMailbox {
                  uint32 target,
                  uint32 sync_point,
                  const gfx::Size& size_in_pixels,
-                 bool allow_overlay);
+                 bool bound_to_gl_image);
   TextureMailbox(SharedBitmap* shared_bitmap, const gfx::Size& size_in_pixels);
 
   ~TextureMailbox();
@@ -45,7 +45,7 @@ class CC_EXPORT TextureMailbox {
     mailbox_holder_.sync_point = sync_point;
   }
 
-  bool allow_overlay() const { return allow_overlay_; }
+  bool bound_to_gl_image() const { return bound_to_gl_image_; }
   bool nearest_neighbor() const { return nearest_neighbor_; }
   void set_nearest_neighbor(bool nearest_neighbor) {
     nearest_neighbor_ = nearest_neighbor;
@@ -61,7 +61,7 @@ class CC_EXPORT TextureMailbox {
   gpu::MailboxHolder mailbox_holder_;
   SharedBitmap* shared_bitmap_;
   gfx::Size size_in_pixels_;
-  bool allow_overlay_;
+  bool bound_to_gl_image_;
   bool nearest_neighbor_;
 };