Move code in ui/gl/* from gfx:: to gl::

components/display_compositor/gl_helper_unittest.cc

Index: components/display_compositor/gl_helper_unittest.cc
diff --git a/components/display_compositor/gl_helper_unittest.cc b/components/display_compositor/gl_helper_unittest.cc
index 5800c970cc51fbc18ed3f471167431dd6ea53bef..ef67697dee545ae7b42dfc36b0983f7e29b3b007 100644
--- a/components/display_compositor/gl_helper_unittest.cc
+++ b/components/display_compositor/gl_helper_unittest.cc
@@ -73,7 +73,7 @@ class GLHelperTest : public testing::Test {
         gfx::kNullAcceleratedWidget, /* window */
         gfx::Size(1, 1),             /* size */
         nullptr,                     /* share_context */
-        attributes, gfx::PreferDiscreteGpu, gpu::SharedMemoryLimits(),
+        attributes, gl::PreferDiscreteGpu, gpu::SharedMemoryLimits(),
         nullptr, /* gpu_memory_buffer_manager */
         nullptr /* image_factory */));
     gl_ = context_->GetImplementation();
@@ -1268,7 +1268,7 @@ class GLHelperTest : public testing::Test {
 
 class GLHelperPixelTest : public GLHelperTest {
  private:
-  gfx::DisableNullDrawGLBindings enable_pixel_output_;
+  gl::DisableNullDrawGLBindings enable_pixel_output_;
 };
 
 TEST_F(GLHelperTest, RGBASyncReadbackTest) {