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Both oobe_dialog_host.css and screen_gaia_signin.css had :host rules.
Removed one from screen_gaia_signin.css
Also removed v2 class - introduced saml-interstitial class. Alternative would
be to keep saml-interstitial with the same size and not shirk it

Bug: 971172
Change-Id: Ib9e93c4bc347910286812114df29579467c0b2cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645360Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666248}