Fix fuzzy infobar shadow on Nexus 5X.

chrome/android/java/res/drawable/infobar_bg.xml

Index: chrome/android/java/res/drawable/infobar_bg.xml
diff --git a/chrome/android/java/res/drawable/keyboard_accessory_background.xml b/chrome/android/java/res/drawable/infobar_bg.xml
similarity index 53%
copy from chrome/android/java/res/drawable/keyboard_accessory_background.xml
copy to chrome/android/java/res/drawable/infobar_bg.xml
index 815d13d91f16257394bc0c62cb2355e89c2b7311..aca9192175ce235ff593d1c8db9bea9604ae137b 100644
--- a/chrome/android/java/res/drawable/keyboard_accessory_background.xml
+++ b/chrome/android/java/res/drawable/infobar_bg.xml
@@ -3,15 +3,14 @@
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
-<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
     <item>
-        <shape>
-            <solid android:color="#DDD"/>
-        </shape>
+      <bitmap
+          android:src="@drawable/infobar_shadow"
+          android:gravity="top|fill_horizontal"
+          android:tileMode="disabled" />
     </item>
-    <item android:top="1dp">
-        <shape>
-            <solid android:color="#FFF"/>
-        </shape>
-    </item>
-</layer-list>
+    <item
+        android:top="10dp"
+        android:drawable="@android:color/white" />
+</layer-list>