[Mac] Allow "Enter" to activate the buttons in the new 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 cbdbc703cd1c1592f58d667de3fac489f5371169..b86fd5541f34527ef4bbcf38841f86eec36d2cdc 100644
--- a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #import <Cocoa/Cocoa.h>
+#import <Carbon/Carbon.h>  // kVK_Return.
 
 #import "chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h"
 
@@ -789,6 +790,16 @@ class ActiveProfileObserverBridge : public AvatarMenuObserver,
   [[self cell] setBackgroundColor:backgroundColor];
 }
 
+-(void)keyDown:(NSEvent*)event {
+  // Since there is no default button in the bubble, it is safe to activate
+  // all buttons on Enter as well, and be consistent with the Windows
+  // implementation.
+  if ([event keyCode] == kVK_Return)
+    [self performClick:self];
+  else
+    [super keyDown:event];
+}
+
 - (BOOL)canBecomeKeyView {
   return YES;
 }