Restrict usage of mesa headers to targets that really need them

content/common/gpu/image_transport_surface_mac.mm

Index: content/common/gpu/image_transport_surface_mac.mm
diff --git a/content/common/gpu/image_transport_surface_mac.mm b/content/common/gpu/image_transport_surface_mac.mm
index c193f6f70d90739c232a638822fd7c97279cdad5..3a48063c7a008ee7aa46eb68f178d88a4903ed37 100644
--- a/content/common/gpu/image_transport_surface_mac.mm
+++ b/content/common/gpu/image_transport_surface_mac.mm
@@ -18,7 +18,8 @@ namespace {
 class DRTSurfaceOSMesa : public gfx::GLSurfaceOSMesa {
  public:
   // Size doesn't matter, the surface is resized to the right size later.
-  DRTSurfaceOSMesa() : GLSurfaceOSMesa(GL_RGBA, gfx::Size(1, 1)) {}
+  DRTSurfaceOSMesa()
+      : GLSurfaceOSMesa(gfx::OSMesaSurfaceFormatRGBA, gfx::Size(1, 1)) {}
 
   // Implement a subset of GLSurface.
   virtual bool SwapBuffers() OVERRIDE;