Fix chrome.identity.onSignInChanged regression for sign-outs

This change fixes a regression from r270325, allowing sign-out events
to fire when the --enable-new-profile-management flag is absent, which
is the default.

The previous change added a check to filter out events related to
non-primary accounts, but the primary account ID is not available
during sign-out. Removing the filter fixes the regression.

BUG=376421

Review URL: https://codereview.chromium.org/346913003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278762 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/api/identity/identity_api.cc

@@ -219,12 +219,6 @@ void IdentityAPI::OnAccountRemoved(const AccountIds& ids) {}
 
 void IdentityAPI::OnAccountSignInChanged(const AccountIds& ids,
                                          bool is_signed_in) {
-  const std::string primary_account_id = GetPrimaryAccountId(browser_context_);
-  if (primary_account_id != ids.account_key &&
-      !switches::IsExtensionsMultiAccount()) {
-    return;
-  }
-
   api::identity::AccountInfo account_info;
   account_info.id = ids.gaia;