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

ui/gl/gl_context_stub_with_extensions.h

Index: ui/gl/gl_context_stub_with_extensions.h
diff --git a/ui/gl/gl_context_stub_with_extensions.h b/ui/gl/gl_context_stub_with_extensions.h
index 175dde94c85018eb9a6ea2feb3410ebe5672ea0a..3d4f7993cb74e1bdd3c1f1ea1994e7ab2c9f7f4c 100644
--- a/ui/gl/gl_context_stub_with_extensions.h
+++ b/ui/gl/gl_context_stub_with_extensions.h
@@ -9,12 +9,12 @@
 #include "ui/gl/gl_context_stub.h"
 #include "ui/gl/gl_export.h"
 
-namespace gfx {
+namespace gl {
 
 // Lightweight GLContext stub implementation that returns a constructed
 // extensions string.  We use this to create a context that we can use to
 // initialize GL extensions with, without actually creating a platform context.
-class GL_EXPORT GLContextStubWithExtensions : public gfx::GLContextStub {
+class GL_EXPORT GLContextStubWithExtensions : public gl::GLContextStub {
  public:
   GLContextStubWithExtensions() {}
   std::string GetExtensions() override;
@@ -35,6 +35,6 @@ class GL_EXPORT GLContextStubWithExtensions : public gfx::GLContextStub {
   DISALLOW_COPY_AND_ASSIGN(GLContextStubWithExtensions);
 };
 
-}  // namespace gfx
+}  // namespace gl
 
 #endif  // UI_GL_GL_CONTEXT_STUB_WITH_EXTENSIONS_H_