Use ExtensionRegistryObserver instead of deprecated extension notification from c/b/e/api.

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

Index: chrome/browser/extensions/api/alarms/alarms_api.cc
diff --git a/chrome/browser/extensions/api/alarms/alarms_api.cc b/chrome/browser/extensions/api/alarms/alarms_api.cc
index 4de16708e7cb39767d0e50c3d1c5d3a9616c7ea9..b8db084b2db06157019f01b30dcaf7a86b628953 100644
--- a/chrome/browser/extensions/api/alarms/alarms_api.cc
+++ b/chrome/browser/extensions/api/alarms/alarms_api.cc
@@ -119,7 +119,7 @@ bool AlarmsCreateFunction::RunAsync() {
                   Manifest::IsUnpackedLocation(GetExtension()->location()) ?
                   kDevDelayMinimum : kReleaseDelayMinimum),
               clock_->Now());
-  AlarmManager::Get(GetProfile())->AddAlarm(
+  AlarmManager::Get(browser_context())->AddAlarm(
       extension_id(), alarm, base::Bind(&AlarmsCreateFunction::Callback, this));
 
   return true;
@@ -134,7 +134,7 @@ bool AlarmsGetFunction::RunAsync() {
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   std::string name = params->name.get() ? *params->name : kDefaultAlarmName;
-  AlarmManager::Get(GetProfile())
+  AlarmManager::Get(browser_context())
       ->GetAlarm(extension_id(),
                  name,
                  base::Bind(&AlarmsGetFunction::Callback, this, name));
@@ -151,7 +151,7 @@ void AlarmsGetFunction::Callback(
 }
 
 bool AlarmsGetAllFunction::RunAsync() {
-  AlarmManager::Get(GetProfile())->GetAllAlarms(
+  AlarmManager::Get(browser_context())->GetAllAlarms(
       extension_id(), base::Bind(&AlarmsGetAllFunction::Callback, this));
   return true;
 }
@@ -176,7 +176,7 @@ bool AlarmsClearFunction::RunAsync() {
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   std::string name = params->name.get() ? *params->name : kDefaultAlarmName;
-  AlarmManager::Get(GetProfile())
+  AlarmManager::Get(browser_context())
       ->RemoveAlarm(extension_id(),
                     name,
                     base::Bind(&AlarmsClearFunction::Callback, this, name));
@@ -190,7 +190,7 @@ void AlarmsClearFunction::Callback(const std::string& name, bool success) {
 }
 
 bool AlarmsClearAllFunction::RunAsync() {
-  AlarmManager::Get(GetProfile())->RemoveAllAlarms(
+  AlarmManager::Get(browser_context())->RemoveAllAlarms(
       extension_id(), base::Bind(&AlarmsClearAllFunction::Callback, this));
   return true;
 }