[Mac] Allow using the arrow keys for tabbing in the avatar bubble.

chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm

Index: chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
diff --git a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
index 9771594584064c805c2470ec3c804bb4595d55aa..da30d435bab9e16714cf5fe8e8cbd707895a9bc4 100644
--- a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
@@ -1042,6 +1042,14 @@ class ActiveProfileObserverBridge : public AvatarMenuObserver,
   [super windowWillClose:notification];
 }
 
+- (void)moveDown:(id)sender {
+  [[self window] selectNextKeyView:self];
+}
+
+- (void)moveUp:(id)sender {
+  [[self window] selectPreviousKeyView:self];
+}
+
 - (void)cleanUpEmbeddedViewContents {
   webContents_.reset();
 }