[Mac] User manager should show up as a standalone window.

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

Index: chrome/browser/ui/cocoa/browser/profile_chooser_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser/profile_chooser_controller.mm b/chrome/browser/ui/cocoa/browser/profile_chooser_controller.mm
index 386db324f2a4d0f8e46036bdcfbc1c26d67d6365..7ebf8c529eda41b2b23eca15cd5d46782e788f94 100644
--- a/chrome/browser/ui/cocoa/browser/profile_chooser_controller.mm
+++ b/chrome/browser/ui/cocoa/browser/profile_chooser_controller.mm
@@ -15,6 +15,7 @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profile_window.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/info_bubble_view.h"
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
@@ -103,9 +104,14 @@ void SetWindowSize(NSWindow* window, NSSize size) {
 }
 
 - (IBAction)showUserManager:(id)sender {
-  // TODO(noms): This should use chrome::ShowUserManager() when the
-  // implementation is ready.
-  chrome::ShowSingletonTab(browser_, GURL(chrome::kChromeUIUserManagerURL));
+  // Only non-guest users appear in the User Manager.
+  base::FilePath profile_path;
+  // The button tag indicates whether the active profile is a non-guest profile.
+  if ([sender tag]) {
+    size_t active_index = avatarMenu_->GetActiveProfileIndex();
+    profile_path = avatarMenu_->GetItemAt(active_index).profile_path;
+  }
+  chrome::ShowUserManager(profile_path);
 }
 
 - (IBAction)switchToGuestProfile:(id)sender {
@@ -147,6 +153,9 @@ void SetWindowSize(NSWindow* window, NSSize size) {
   NSView* currentProfileView = nil;
   base::scoped_nsobject<NSMutableArray> otherProfiles(
       [[NSMutableArray alloc] init]);
+
+  // By default, assume the active profile is a guest, and change this
+  // if an active profile is discovered.
   BOOL isGuestView = YES;
 
   for (size_t i = 0; i < avatarMenu_->GetNumberOfItems(); ++i) {
@@ -286,6 +295,7 @@ void SetWindowSize(NSWindow* window, NSSize size) {
             withTextResourceId:IDS_PROFILES_ALL_PEOPLE_BUTTON
                 withResourceId:IDR_ICON_PROFILES_ADD_USER];
   [allUsersButton setTarget:self];
+  [allUsersButton setTag:!isGuestView];
   [allUsersButton setAction:@selector(showUserManager:)];
   yOffset = NSMaxY([allUsersButton frame]) + kSmallVerticalSpacing;