Clear existing alarms when uninstalling extension.

chrome/browser/extensions/api/alarms/alarm_manager.cc

Index: chrome/browser/extensions/api/alarms/alarm_manager.cc
diff --git a/chrome/browser/extensions/api/alarms/alarm_manager.cc b/chrome/browser/extensions/api/alarms/alarm_manager.cc
index 74b1e03bbd61e9be7df5eb9f4516a211a23f1789..cc4385532aa831358db2f101387f1dd329bf4151 100644
--- a/chrome/browser/extensions/api/alarms/alarm_manager.cc
+++ b/chrome/browser/extensions/api/alarms/alarm_manager.cc
@@ -97,6 +97,8 @@ AlarmManager::AlarmManager(Profile* profile)
       delegate_(new DefaultAlarmDelegate(profile)) {
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
                  content::Source<Profile>(profile_));
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNINSTALLED,
+                 content::Source<Profile>(profile_));
 
   StateStore* storage = ExtensionSystem::Get(profile_)->state_store();
   if (storage)
@@ -344,6 +346,12 @@ void AlarmManager::Observe(
       }
       break;
     }
+    case chrome::NOTIFICATION_EXTENSION_UNINSTALLED: {
+      const Extension* extension =
+          content::Details<const Extension>(details).ptr();
+      RemoveAllAlarms(extension->id());
+      break;
+    }
     default:
       NOTREACHED();
       break;