Add ManagePasswordsBubbleCocoa and unit tests.

chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.mm

Index: chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.mm b/chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.mm
index 747d16870725612eae4c4b7d4c39be360bd6ccb5..4f9528f932eeb0dba71d014b62ecf36899e5e81b 100644
--- a/chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.mm
+++ b/chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.mm
@@ -7,6 +7,7 @@
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/command_updater.h"
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
+#include "chrome/browser/ui/cocoa/passwords/manage_passwords_bubble_cocoa.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 // ManagePasswordsIconCocoa
@@ -58,7 +59,8 @@ void ManagePasswordsDecoration::UpdateVisibleUI() {
   if (icon_->state() == password_manager::ui::INACTIVE_STATE) {
     SetVisible(false);
     SetImage(nil);
-    // TODO(dconnelly): Hide the bubble once it is implemented.
+    if (ManagePasswordsBubbleCocoa::instance())
+      ManagePasswordsBubbleCocoa::instance()->Close();
     return;
   }
   SetVisible(true);