gpu: Move buffer format to target texture map into gpu host.

ui/aura/mus/mus_context_factory.cc

Index: ui/aura/mus/mus_context_factory.cc
diff --git a/ui/aura/mus/mus_context_factory.cc b/ui/aura/mus/mus_context_factory.cc
index 6188eb06e2c3375d19c43d6cd19d7bc2bd7700e4..da0b1263ac75db1db3deed4f305791251d9ea0cd 100644
--- a/ui/aura/mus/mus_context_factory.cc
+++ b/ui/aura/mus/mus_context_factory.cc
@@ -12,10 +12,6 @@
 #include "ui/gl/gl_bindings.h"
 
 namespace aura {
-namespace {
-
-
-}  // namespace
 
 MusContextFactory::MusContextFactory(ui::Gpu* gpu) : gpu_(gpu) {}
 
@@ -51,7 +47,7 @@ bool MusContextFactory::DoesCreateTestContexts() {
 
 uint32_t MusContextFactory::GetImageTextureTarget(gfx::BufferFormat format,
                                                   gfx::BufferUsage usage) {
-  // No GpuMemoryBuffer support, so just return GL_TEXTURE_2D.
+  // TODO(sad): http://crbug.com/675431
   return GL_TEXTURE_2D;
 }