bitmap_uploader: delete dead code

services/ui/public/cpp/lib/bitmap_uploader.cc

Index: services/ui/public/cpp/lib/bitmap_uploader.cc
diff --git a/services/ui/public/cpp/lib/bitmap_uploader.cc b/services/ui/public/cpp/lib/bitmap_uploader.cc
index bb2483c93679875b53727da2014878c3acfd2d2f..0d5c1d7f21e2b012818f23b0783b863580065a66 100644
--- a/services/ui/public/cpp/lib/bitmap_uploader.cc
+++ b/services/ui/public/cpp/lib/bitmap_uploader.cc
@@ -33,8 +33,7 @@ BitmapUploader::BitmapUploader(Window* window)
       width_(0),
       height_(0),
       format_(BGRA),
-      next_resource_id_(1u),
-      id_namespace_(0u) {}
+      next_resource_id_(1u) {}
 
 BitmapUploader::~BitmapUploader() {
 }
@@ -185,12 +184,6 @@ uint32_t BitmapUploader::BindTextureForSize(const gfx::Size& size) {
   return texture;
 }
 
-void BitmapUploader::SetIdNamespace(uint32_t id_namespace) {
-  id_namespace_ = id_namespace;
-  if (color_ != g_transparent_color || bitmap_.get())
-    Upload();
-}
-
 void BitmapUploader::OnResourcesReturned(
     WindowSurface* surface,
     mojo::Array<cc::ReturnedResource> resources) {