[GCPW] Use new Gaia endpoint specific for GCPW when running GLS

Bug: 942539
Change-Id: I3b7226c5193a47664683b630300ac917df81d07f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1525989Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Roger Tawa <rogerta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644816}

chrome/credential_provider/gaiacp/gaia_credential_base.cc

@@ -665,27 +665,21 @@ HRESULT CGaiaCredentialBase::GetBaseGlsCommandline(
 
   command_line->AppendSwitch(kGcpwSigninSwitch);
 
-  // Temporary endpoint while waiting for the real GCPW endpoint to be
-  // finished.
-  GURL endpoint_url = GaiaUrls::GetInstance()->embedded_signin_url();
-  std::string endpoint_path = endpoint_url.path().substr(1);
-
   // Registry specified endpoint.
   wchar_t endpoint_url_setting[256];
   ULONG endpoint_url_length = base::size(endpoint_url_setting);
   if (SUCCEEDED(GetGlobalFlag(L"ep_url", endpoint_url_setting,
                               &endpoint_url_length)) &&
       endpoint_url_setting[0]) {
-    endpoint_url = GURL(endpoint_url_setting);
+    GURL endpoint_url(endpoint_url_setting);
     if (endpoint_url.is_valid()) {
       command_line->AppendSwitchASCII(switches::kGaiaUrl,
                                       endpoint_url.GetWithEmptyPath().spec());
-      endpoint_path = endpoint_url.path().substr(1);
+      command_line->AppendSwitchASCII(kGcpwEndpointPathSwitch,
+                                      endpoint_url.path().substr(1));
     }
   }
 
-  command_line->AppendSwitchASCII(kGcpwEndpointPathSwitch, endpoint_path);
-
   // Get the language selected by the LanguageSelector and pass it onto Chrome.
   // The language will depend on if it is currently a SYSTEM logon (initial
   // logon) or a lock screen logon (from a user). If the user who locked the