Inherit default text color from MainTheme.

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:minHeight="36dp"
     android:gravity="center_vertical">
 
     <ImageView
         android:id="@+id/control_icon"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginEnd="@dimen/infobar_control_margin_between_items"
         android:scaleType="centerInside"
         android:contentDescription="@null" />
 
     <org.chromium.chrome.browser.widget.DualControlLayout
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:layout_weight="1" >
 
         <TextView
             android:id="@+id/control_message"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:textSize="@dimen/infobar_text_size"
-            android:textColor="@color/default_text_color" />
+            android:textSize="@dimen/infobar_text_size" />
 
         <TextView
             android:id="@+id/control_secondary_message"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:textSize="@dimen/infobar_text_size"
             android:textColor="@color/infobar_descriptive_text_color" />
 
     </org.chromium.chrome.browser.widget.DualControlLayout>
 
 </LinearLayout>