cros: Update saml banner text and style.

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

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.css
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.css b/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
index 10f2256cc120ba09f2b4022ff34f4a8c5dbc6f32..17a480bfb4350c60e3fac7fe24e9c4bf3bf72afb 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
@@ -14,7 +14,7 @@
 }
 
 #gaia-signin.saml {
-  padding: 75px 10px 10px;
+  padding: 75px 0 0;

[bartfab (slow), 2014/01/29 15:29:38]

Nit: Would padding-top: 75px not be sufficient?

[xiyuan, 2014/01/29 16:12:34]

The top padding is space for logo and saml notice banner. It should be enough
for one-line banner text.

[bartfab (slow), 2014/01/29 16:30:17]

What I meant was whether |padding-top: 75px| would not be a sufficient and
equivalent CSS statement for exactly the same thing as |padding: 75px 0 0|. I
find the former easier to parse than the latter. But it was an optional nit
anyway.

[xiyuan, 2014/01/29 16:32:10]

Oh, we need the '0 0' to override the non-saml #gaia-signin's style at line 8.

[bartfab (slow), 2014/01/30 09:54:54]

Ah, good to know. Thanks for clarifying.

 }
 
 #signin-right {
@@ -156,9 +156,5 @@
 }
 
 #saml-notice-message {
-  background-color: rgb(250, 245, 202);
-  border: 2px solid rgb(250, 245, 202);
-  border-radius: 2px;
-  margin-left: auto;
-  margin-right: auto;
+  margin: 0 auto;
 }