ui/gl: Move GLImage into gl namespace.

content/common/gpu/media/avda_codec_image.h

Index: content/common/gpu/media/avda_codec_image.h
diff --git a/content/common/gpu/media/avda_codec_image.h b/content/common/gpu/media/avda_codec_image.h
index 0ced55c5a58ec6fbd53cd3122fc039073a20fcc6..cba3416d349b1fe6193ecf8b1337cdfc3006d30a 100644
--- a/content/common/gpu/media/avda_codec_image.h
+++ b/content/common/gpu/media/avda_codec_image.h
@@ -12,7 +12,7 @@ namespace content {
 
 // GLImage that renders MediaCodec buffers to a SurfaceTexture as needed
 // in order to draw them.
-class AVDACodecImage : public gfx::GLImage {
+class AVDACodecImage : public gl::GLImage {
  public:
   AVDACodecImage(const scoped_refptr<AVDASharedState>&,
                  media::VideoCodecBridge* codec,
@@ -23,7 +23,7 @@ class AVDACodecImage : public gfx::GLImage {
   ~AVDACodecImage() override;
 
  public:
-  // gfx::GLImage implementation
+  // gl::GLImage implementation
   void Destroy(bool have_context) override;
   gfx::Size GetSize() override;
   unsigned GetInternalFormat() override;