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

ui/gl/gl_context_wgl.cc

Index: ui/gl/gl_context_wgl.cc
diff --git a/ui/gl/gl_context_wgl.cc b/ui/gl/gl_context_wgl.cc
index 81926a644005fb57332802e799f776e7ed98d6b7..638623cea6bac82045361261418bc187e20e29aa 100644
--- a/ui/gl/gl_context_wgl.cc
+++ b/ui/gl/gl_context_wgl.cc
@@ -12,7 +12,7 @@
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_wgl.h"
 
-namespace gfx {
+namespace gl {
 
 GLContextWGL::GLContextWGL(GLShareGroup* share_group)
     : GLContextReal(share_group), context_(nullptr) {
@@ -115,7 +115,7 @@ void* GLContextWGL::GetHandle() {
 
 void GLContextWGL::OnSetSwapInterval(int interval) {
   DCHECK(IsCurrent(nullptr));
-  if (gfx::g_driver_wgl.ext.b_WGL_EXT_swap_control) {
+  if (gl::g_driver_wgl.ext.b_WGL_EXT_swap_control) {
     wglSwapIntervalEXT(interval);
   } else {
       LOG(WARNING) <<
@@ -141,4 +141,4 @@ GLContextWGL::~GLContextWGL() {
   Destroy();
 }
 
-}  // namespace gfx
+}  // namespace gl