Bug 735230 - Part 4: Don't call MakeCurrent with a context and without a surface. r=gw280

gfx/gl/GLContextProviderEGL.cpp

@@ -434,7 +434,7 @@ public:
             // but we will be able to do things like resource releases.
             succeeded = sEGLLibrary.fMakeCurrent(EGL_DISPLAY(),
                                                  EGL_NO_SURFACE, EGL_NO_SURFACE,
-                                                 mContext);
+                                                 EGL_NO_CONTEXT);
             if (!succeeded && sEGLLibrary.fGetError() == LOCAL_EGL_CONTEXT_LOST) {
                 mContextLost = true;
                 NS_WARNING("EGL context has been lost.");