Properly handle disabling sync via the google dashboard.

chrome/browser/signin/signin_manager.h

Index: chrome/browser/signin/signin_manager.h
diff --git a/chrome/browser/signin/signin_manager.h b/chrome/browser/signin/signin_manager.h
index 8518a2f3489e7e129e83deb1cc4fc887904d9d93..f3fece45efd8f9559ddca455971b8978333dc040 100644
--- a/chrome/browser/signin/signin_manager.h
+++ b/chrome/browser/signin/signin_manager.h
@@ -188,6 +188,13 @@ class SigninManager : public GaiaAuthConsumer,
   // ProfileKeyedService implementation.
   virtual void Shutdown() OVERRIDE;
 
+  // Tells the SigninManager to prohibit signout for this profile.
+  void ProhibitSignout();
+
+  // If true, signout is prohibited for this profile (calls to SignOut() are
+  // ignored).
+  bool IsSignoutProhibited() const;
+
  protected:
   // Weak pointer to parent profile (protected so FakeSigninManager can access
   // it).
@@ -198,6 +205,9 @@ class SigninManager : public GaiaAuthConsumer,
   // SigninManager (so we can expose a reference for use in the wrench menu).
   scoped_ptr<SigninGlobalError> signin_global_error_;
 
+  // Flag saying whether signing out is allowed.
+  bool prohibit_signout_;
+
  private:
   enum SigninType {
     SIGNIN_TYPE_NONE,