[Ozone-DRI] Removing MockDriSurface implementation

ui/ozone/platform/dri/dri_surface.cc

Index: ui/ozone/platform/dri/dri_surface.cc
diff --git a/ui/ozone/platform/dri/dri_surface.cc b/ui/ozone/platform/dri/dri_surface.cc
index 0dbfdf9d02fbbdc1ba5de5888a5787e51cd85c67..634654a8afbcc56454e921e0098abbe9856b7cd6 100644
--- a/ui/ozone/platform/dri/dri_surface.cc
+++ b/ui/ozone/platform/dri/dri_surface.cc
@@ -31,7 +31,7 @@ DriSurface::~DriSurface() {
 
 bool DriSurface::Initialize() {
   for (size_t i = 0; i < arraysize(bitmaps_); ++i) {
-    bitmaps_[i].reset(CreateBuffer());
+    bitmaps_[i].reset(new DriBuffer(dri_));
     // TODO(dnicoara) Should select the configuration based on what the
     // underlying system supports.
     SkImageInfo info = SkImageInfo::MakeN32Premul(size_.width(),
@@ -76,6 +76,4 @@ SkCanvas* DriSurface::GetDrawableForWidget() {
   return backbuffer()->canvas();
 }
 
-DriBuffer* DriSurface::CreateBuffer() { return new DriBuffer(dri_); }
-
 }  // namespace ui