Remove unused and unimplemented method.

Method was declared but not implemented or called.

Change-Id: Ia01eabfd96bb4aea46212d00e77a3215e4e086ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825637
Commit-Queue: Dana Fried <dfried@chromium.org>
Commit-Queue: Caroline Rising <corising@chromium.org>
Auto-Submit: Dana Fried <dfried@chromium.org>
Reviewed-by: Caroline Rising <corising@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699844}

chrome/browser/ui/views/frame/browser_view_layout.h

@@ -122,11 +122,6 @@ class BrowserViewLayout : public views::LayoutManager {
   // the bookmark bar and the toolbar.
   void UpdateTopContainerBounds();
 
-  // Returns the top margin to adjust the contents_container_ by. This is used
-  // to make the bookmark bar and contents_container_ overlap so that the
-  // preview contents hides the bookmark bar.
-  int GetTopMarginForActiveContent();
-
   // Layout the Download Shelf, returns the coordinate of the top of the
   // control, for laying out the previous control.
   int LayoutDownloadShelf(int bottom);