Contacts Picker: Set text appearance for explanation text.

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Bug: 993746, 860467
Change-Id: I6922f39db47de5c20d01d8eaf42894b8469f2dbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773257
Auto-Submit: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Theresa  <twellington@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690965}

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

@@ -16,7 +16,8 @@
         android:layout_marginTop="16dp"
         android:layout_marginBottom="12dp"
         android:layout_marginStart="20dp"
-        android:layout_marginEnd="16dp" />
+        android:layout_marginEnd="16dp"
+        android:textAppearance="@style/TextAppearance.BlackBody" />
 
     <LinearLayout
         android:id="@+id/chip_container"