[Mac] Fix accessibility crash because I am terrible with dynamic types.

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 621a6e705f09b390bb4a6a95a83b5069f55adc39..ad54f93b5a665fe8226909e1b64c2aca00e07953 100644
--- a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
@@ -773,7 +773,7 @@ class ActiveProfileObserverBridge : public AvatarMenuObserver,
 }
 
 - (id)accessibilityAttributeValue:(NSString*)attribute {
-  return @[];
+  return nil;
 }
 
 - (BOOL)canBecomeKeyView {
@@ -1152,7 +1152,7 @@ class ActiveProfileObserverBridge : public AvatarMenuObserver,
   // Add a dummy, empty element so that we don't initially display any
   // focus rings.
   NSButton* dummyFocusButton =
-      [[[DummyWindowFocusButton alloc] initWithFrame:NSZeroRect] autorelease];
+     [[[DummyWindowFocusButton alloc] initWithFrame:NSZeroRect] autorelease];
   [dummyFocusButton setNextKeyView:subView];
   [[self window] makeFirstResponder:dummyFocusButton];