GLContext no longer holds a pointer to a GLSurface.

ui/gfx/gl/gl_surface_osmesa.cc

Index: ui/gfx/gl/gl_surface_osmesa.cc
===================================================================
--- ui/gfx/gl/gl_surface_osmesa.cc	(revision 86168)
+++ ui/gfx/gl/gl_surface_osmesa.cc	(working copy)
@@ -8,7 +8,9 @@
 
 namespace gfx {
 
-GLSurfaceOSMesa::GLSurfaceOSMesa(const gfx::Size& size) : size_(size) {
+GLSurfaceOSMesa::GLSurfaceOSMesa(unsigned format, const gfx::Size& size)
+    : format_(format),
+      size_(size) {
 }
 
 GLSurfaceOSMesa::~GLSurfaceOSMesa() {
@@ -63,6 +65,10 @@
   return buffer_.get();
 }
 
+unsigned GLSurfaceOSMesa::GetFormat() {
+  return format_;
+}
+
 void GLSurfaceOSMesa::AllocateBuffer(const Size& size) {
   buffer_.reset(new int32[size.GetArea()]);
   memset(buffer_.get(), 0, size.GetArea() * sizeof(buffer_[0]));