[Omnibox] Remove TODO (that was done)

This CL removes a TODO that was left in the code when the to do was done.
(That being to separate OmniboxMatchCellView to its own file).

There are no logic changes in this CL.

Bug: None
Change-Id: Idc85e8dfad6a0b15e5458ac09ca92f070aaa923d
Reviewed-on: https://chromium-review.googlesource.com/1038662Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555398}

chrome/browser/ui/views/omnibox/omnibox_match_cell_view.cc

@@ -106,10 +106,6 @@ class OmniboxImageView : public views::ImageView {
 ////////////////////////////////////////////////////////////////////////////////
 // OmniboxMatchCellView:
 
-// TODO(dschuyler): Move this class to its own file. The reason it started in
-// the omnibox_result_view file was to ease the refactor of this code. I intend
-// to resolve this in mid-2018.
-
 OmniboxMatchCellView::OmniboxMatchCellView(OmniboxResultView* result_view,
                                            const gfx::FontList& font_list,
                                            int text_height)