Export a private webstore API to call into the new inline sign-in flow.

chrome/browser/invalidation/profile_invalidation_auth_provider.cc

Index: chrome/browser/invalidation/profile_invalidation_auth_provider.cc
diff --git a/chrome/browser/invalidation/profile_invalidation_auth_provider.cc b/chrome/browser/invalidation/profile_invalidation_auth_provider.cc
index 468520d60d69d4a67da5292a7810db0a8defcf2c..9c5b5da2b30a963697e6782bdfccafc98a5fd1ea 100644
--- a/chrome/browser/invalidation/profile_invalidation_auth_provider.cc
+++ b/chrome/browser/invalidation/profile_invalidation_auth_provider.cc
@@ -17,10 +17,13 @@ ProfileInvalidationAuthProvider::ProfileInvalidationAuthProvider(
       token_service_(token_service),
       login_ui_service_(login_ui_service) {
   signin_manager_->AddObserver(this);
+  SigninManagerFactory::GetInstance()->AddObserver(this);
 }
 
 ProfileInvalidationAuthProvider::~ProfileInvalidationAuthProvider() {
-  signin_manager_->RemoveObserver(this);
+  SigninManagerFactory::GetInstance()->RemoveObserver(this);
+  if (signin_manager_)
+    signin_manager_->RemoveObserver(this);
 }
 
 std::string ProfileInvalidationAuthProvider::GetAccountId() {
@@ -41,4 +44,12 @@ void ProfileInvalidationAuthProvider::GoogleSignedOut(
   FireInvalidationAuthLogout();
 }
 
+void ProfileInvalidationAuthProvider::SigninManagerShutdown(
+    SigninManagerBase* manager) {
+  if (manager == signin_manager_) {
+    signin_manager_->RemoveObserver(this);
+    signin_manager_ = NULL;
+  }
+}
+
 }  // namespace invalidation