Change namespace from ui to gfx for NativePixmap related code

ui/gl/gl_image_native_pixmap.cc

Index: ui/gl/gl_image_native_pixmap.cc
diff --git a/ui/gl/gl_image_native_pixmap.cc b/ui/gl/gl_image_native_pixmap.cc
index 6acdc36390a46e069a1984230d72da1dce2cf68c..1e74c2d6a2f29b73fd25652d18b82f8a2f516298 100644
--- a/ui/gl/gl_image_native_pixmap.cc
+++ b/ui/gl/gl_image_native_pixmap.cc
@@ -23,7 +23,7 @@
 #define DRM_FORMAT_YVU420 FOURCC('Y', 'V', '1', '2')
 #define DRM_FORMAT_NV12 FOURCC('N', 'V', '1', '2')
 
-namespace ui {
+namespace gl {
 namespace {
 
 bool ValidInternalFormat(unsigned internalformat, gfx::BufferFormat format) {
@@ -121,7 +121,7 @@ GLImageNativePixmap::GLImageNativePixmap(const gfx::Size& size,
 
 GLImageNativePixmap::~GLImageNativePixmap() {}
 
-bool GLImageNativePixmap::Initialize(NativePixmap* pixmap,
+bool GLImageNativePixmap::Initialize(gfx::NativePixmap* pixmap,
                                      gfx::BufferFormat format) {
   DCHECK(!pixmap_);
   if (pixmap->GetEGLClientBuffer()) {
@@ -277,4 +277,4 @@ unsigned GLImageNativePixmap::GetInternalFormatForTesting(
   return GL_NONE;
 }
 
-}  // namespace ui
+}  // namespace gl