OOBE SAML: Adapt SAML css

TBR=antrim@chromium.org

Bug: 1011005
Test: checked locally saml login/saml interstitial
Change-Id: I25888c67ff193bcd6555c71dd83c7f090009ee23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845010Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703705}

chrome/browser/resources/chromeos/login/screen_gaia_signin.css

@@ -117,8 +117,7 @@
   display: none;
 }
 
-:host(.saml) #signin-frame {
-  height: 516px;
+:host(.saml) #signin-frame-container {
   padding-top: 44px;
 }