Move GLSurface creation from //ui/gl to //ui/gl/init.

ui/gl/gl_surface_osmesa.h

Index: ui/gl/gl_surface_osmesa.h
diff --git a/ui/gl/gl_surface_osmesa.h b/ui/gl/gl_surface_osmesa.h
index 9fc8a794dbe63414e6a1110937aae8b9cd2f5583..3155c11cc5885a51290d7a8c63b67ba2ec52f0e3 100644
--- a/ui/gl/gl_surface_osmesa.h
+++ b/ui/gl/gl_surface_osmesa.h
@@ -49,9 +49,9 @@ class GL_EXPORT GLSurfaceOSMesa : public GLSurface {
 // A thin subclass of |GLSurfaceOSMesa| that can be used in place
 // of a native hardware-provided surface when a native surface
 // provider is not available.
-class GLSurfaceOSMesaHeadless : public GLSurfaceOSMesa {
+class GL_EXPORT GLSurfaceOSMesaHeadless : public GLSurfaceOSMesa {
  public:
-  explicit GLSurfaceOSMesaHeadless();
+  GLSurfaceOSMesaHeadless();
 
   bool IsOffscreen() override;
   gfx::SwapResult SwapBuffers() override;