[AF] Polish InfoBar Account Indication Footer

Changed the font color to match that of test of the rest of InfoBar
description, and adjusted padding so that e-mail address is in-line with
the InfoBar description text.

Screenshot in light mode:
https://screenshot.googleplex.com/WvQjfXKKzEasV9e

Screenshot in dark mode:
https://screenshot.googleplex.com/6qGQsoDgHYMafde

Bug: 1152332
Change-Id: Ib5c25e83fac3f7d734bcb35ecfa78c6a15456f53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559714Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Anne Lim <annelim@google.com>
Cr-Commit-Position: refs/heads/master@{#831067}

chrome/android/java/res/layout/infobar_footer.xml

@@ -33,8 +33,9 @@
             android:ellipsize="middle"
             android:layout_height="wrap_content"
             android:layout_width="match_parent"
-            android:paddingStart="@dimen/infobar_padding"
-            android:singleLine="true"/>
+            android:paddingStart="@dimen/infobar_small_icon_margin"
+            android:singleLine="true"
+            android:textAppearance="@style/TextAppearance.TextMedium.Secondary"/>
     </LinearLayout>
 
 </LinearLayout>
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