[Mac][Material Design] Fix bookmark chevron button focus ring location.

chrome/app/nibs/BookmarkBar.xib

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="5056" systemVersion="13F1077" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none">
     <dependencies>
         <deployment version="1060" identifier="macosx"/>
         <development version="5100" identifier="xcode"/>
         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="5056"/>
     </dependencies>
     <objects>
         <customObject id="-2" userLabel="File's Owner" customClass="BookmarkBarController">
             <connections>
                 <outlet property="buttonView_" destination="62" id="65"/>
                 <outlet property="offTheSideButton_" destination="63" id="66"/>
                 <outlet property="view" destination="1" id="93"/>
             </connections>
         </customObject>
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
         <customObject id="-3" userLabel="Application"/>
         <customView hidden="YES" id="1" customClass="BookmarkBarToolbarView">
             <rect key="frame" x="0.0" y="0.0" width="600" height="142"/>
             <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMinY="YES"/>
             <subviews>
                 <button id="63" customClass="BookmarkButton">
                     <rect key="frame" x="586" y="2" width="20" height="24"/>
                     <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxX="YES" heightSizable="YES"/>
-                    <buttonCell key="cell" type="square" bezelStyle="shadowlessSquare" imagePosition="overlaps" alignment="center" borderStyle="border" imageScaling="proportionallyUpOrDown" inset="2" id="64" customClass="BookmarkButtonCell">
+                    <buttonCell key="cell" type="square" bezelStyle="shadowlessSquare" imagePosition="overlaps" alignment="center" borderStyle="border" imageScaling="proportionallyUpOrDown" inset="2" id="64" customClass="OffTheSideButtonCell">
                         <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                     </buttonCell>
                     <connections>
                         <action selector="openOffTheSideFolderFromButton:" target="-2" id="119"/>
                         <outlet property="delegate_" destination="-2" id="137"/>
                     </connections>
                 </button>
                 <customView id="62" customClass="BookmarkBarView">
                     <rect key="frame" x="0.0" y="-2" width="584" height="144"/>
                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
@@ skipping 51 matching lines @@
         </customObject>
         <customObject id="110" customClass="GTMUILocalizerAndLayoutTweaker">
             <connections>
                 <outlet property="localizerOwner_" destination="-2" id="111"/>
                 <outlet property="localizer_" destination="72" id="113"/>
                 <outlet property="uiObject_" destination="62" id="112"/>
             </connections>
         </customObject>
     </objects>
 </document>