Center permission bubble if location bar is hidden in MacOS.

chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.mm

Index: chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.mm b/chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.mm
index 821ddcad6490138052970976561d42895480dfeb..fba3518d9faee19a6dfd883238ce8b7176c92128 100644
--- a/chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.mm
+++ b/chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.mm
@@ -63,10 +63,18 @@ void PermissionBubbleCocoa::OnBubbleClosing() {
 }
 
 NSPoint PermissionBubbleCocoa::GetAnchorPoint() {
-  LocationBarViewMac* location_bar =
-      [[parent_window_ windowController] locationBarBridge];
-  DCHECK(location_bar);
-  NSPoint anchor = location_bar->GetPageInfoBubblePoint();
+  NSPoint anchor;
+  if (HasLocationBar()) {
+    LocationBarViewMac* location_bar =
+        [[parent_window_ windowController] locationBarBridge];
+    anchor = location_bar->GetPageInfoBubblePoint();
+  } else {
+    // Center the bubble if there's no location bar.
+    NSView* content_view = [parent_window_ contentView];
+    anchor.y = NSMaxY(content_view.frame);
+    anchor.x = NSMidX(content_view.frame);
+  }
+
   return [parent_window_ convertBaseToScreen:anchor];
 }
 
@@ -77,3 +85,20 @@ NSWindow* PermissionBubbleCocoa::window() {
 void PermissionBubbleCocoa::SwitchParentWindow(NSWindow* parent) {
   parent_window_ = parent;
 }
+
+bool PermissionBubbleCocoa::HasLocationBar() {
+  LocationBarViewMac* location_bar_bridge =
+      [[parent_window_ windowController] locationBarBridge];
+  if (location_bar_bridge) {
+    // It is necessary to check that the location bar bridge will actually
+    // support the location bar. This is important because an application window
+    // will have a location_bar_bridge but not have a location bar.
+    return location_bar_bridge->browser()->SupportsWindowFeature(
+        Browser::FEATURE_LOCATIONBAR);
+  }
+  return false;
+}
+
+info_bubble::BubbleArrowLocation PermissionBubbleCocoa::GetArrowLocation() {
+  return HasLocationBar() ? info_bubble::kTopLeft : info_bubble::kNoArrow;
+}