Only show quit instruction bubble on browser windows

The new instruction bubble's recommendation to "press Alt+F" won't work on
non-browser windows, so don't show the instructions unless the focused window is
a browser window and has a toolbar.

BUG=243164
R=sky

Change-Id: I1ab550ff57134009a2cbb0a1ee612775c1323e88
Reviewed-on: https://chromium-review.googlesource.com/1197343Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587787}

chrome/browser/ui/views/frame/browser_view.cc

@@ -1180,8 +1180,10 @@ void BrowserView::RotatePaneFocus(bool forwards) {
 
 void BrowserView::DestroyBrowser() {
 #if defined(OS_WIN) || (defined(OS_LINUX) && !defined(OS_CHROMEOS))
-  GetWidget()->GetNativeView()->RemovePreTargetHandler(
-      QuitInstructionBubbleController::GetInstance());
+  if (browser_->SupportsWindowFeature(Browser::FEATURE_TOOLBAR)) {
+    GetWidget()->GetNativeView()->RemovePreTargetHandler(
+        QuitInstructionBubbleController::GetInstance());
+  }
 #endif
 
   // After this returns other parts of Chrome are going to be shutdown. Close
@@ -2299,8 +2301,10 @@ void BrowserView::InitViews() {
                                        browser_->profile());
 
 #if defined(OS_WIN) || (defined(OS_LINUX) && !defined(OS_CHROMEOS))
-  GetWidget()->GetNativeView()->AddPreTargetHandler(
-      QuitInstructionBubbleController::GetInstance());
+  if (browser_->SupportsWindowFeature(Browser::FEATURE_TOOLBAR)) {
+    GetWidget()->GetNativeView()->AddPreTargetHandler(
+        QuitInstructionBubbleController::GetInstance());
+  }
 #endif
 
 #if defined(USE_AURA)