Allow for multiline text display in the accessory sheet label

This allows the TextView to expand beyond 48dp if the text needs to
be displayed on multiple lines.

Bug: 874257
Change-Id: I39a8bbd70bebf8421968e987b3df37ccc9684296
Reviewed-on: https://chromium-review.googlesource.com/1187147Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585789}

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

@@ -10,7 +10,8 @@
     android:paddingStart="16dp"
     android:paddingEnd="16dp"
     android:fillViewport="true"
-    android:layout_height="48dp"
     android:gravity="center_vertical"
     android:textAppearance="@style/BlackHint1"
+    android:minHeight="48dp"
+    android:layout_height="wrap_content"
     android:layout_width="match_parent"/>