chromeos: remove dead code in ash_util

ShouldOpenAshOnStartup() is no longer called.

BUG=none
TEST=none

Change-Id: I489e5376be048c8078f4c4659f336bbb82b85f57
Reviewed-on: https://chromium-review.googlesource.com/1163825Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580928}

chrome/browser/ui/ash/ash_util.cc

@@ -21,10 +21,6 @@
 
 namespace ash_util {
 
-bool ShouldOpenAshOnStartup() {
-  return features::IsAshInBrowserProcess();
-}
-
 bool IsAcceleratorDeprecated(const ui::Accelerator& accelerator) {
   // When running in mash the browser doesn't handle ash accelerators.
   if (!features::IsAshInBrowserProcess())

chrome/browser/ui/ash/ash_util.h

@@ -20,9 +20,6 @@ class KeyEvent;
 
 namespace ash_util {
 
-// Returns true if Ash should be run at startup.
-bool ShouldOpenAshOnStartup();
-
 // Returns true if the given |accelerator| has been deprecated and hence can
 // be consumed by web contents if needed.
 bool IsAcceleratorDeprecated(const ui::Accelerator& accelerator);