Fix some new tanslate infobar UI bugs

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

Index: chrome/android/java/res/layout/infobar_translate_compact_content.xml
diff --git a/chrome/android/java/res/layout/infobar_translate_compact_content.xml b/chrome/android/java/res/layout/infobar_translate_compact_content.xml
index f8e3ab2ce594951468c1ba385d42202218d8e6ea..121e681b31d0af7e17fa40136fcfd027c63b4418 100644
--- a/chrome/android/java/res/layout/infobar_translate_compact_content.xml
+++ b/chrome/android/java/res/layout/infobar_translate_compact_content.xml
@@ -3,7 +3,6 @@
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
-<!-- TODO(googleo): Add correct style based on spec and contentDescription. -->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/translate_infobar_content"
@@ -32,7 +31,7 @@
         android:minWidth="@dimen/min_touch_target_size"
         android:scaleType="center"
         android:background="?attr/selectableItemBackground"
-        android:contentDescription="@null"
+        android:contentDescription="@string/accessibility_toolbar_btn_menu"
         android:src="@drawable/btn_menu"
         app:tint="@color/dark_mode_tint" />
 </LinearLayout>