[Mac] Remove unnecessary subclasses in bookmark bar

chrome/app/nibs/BookmarkBar.xib

Index: chrome/app/nibs/BookmarkBar.xib
diff --git a/chrome/app/nibs/BookmarkBar.xib b/chrome/app/nibs/BookmarkBar.xib
index c1cfabd8047b3ca1efd2b14dd484cd9c0e67d8aa..a3d01fad9705fac52ae8f7aa5d2122134cb04c53 100644
--- a/chrome/app/nibs/BookmarkBar.xib
+++ b/chrome/app/nibs/BookmarkBar.xib
@@ -34,7 +34,7 @@
                     <rect key="frame" x="0.0" y="-2" width="584" height="144"/>
                     <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMinY="YES" flexibleMaxY="YES"/>
                     <subviews>
-                        <customView hidden="YES" id="109" customClass="BookmarkBarItemContainer">
+                        <customView hidden="YES" id="109" customClass="GTMWidthBasedTweaker">
                             <rect key="frame" x="0.0" y="103" width="596" height="41"/>
                             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES"/>
                             <subviews>
@@ -49,7 +49,7 @@
                                         <action selector="importBookmarks:" target="-2" id="116"/>
                                     </connections>
                                 </button>
-                                <textField verticalHuggingPriority="750" id="82" customClass="BookmarkBarTextField">
+                                <textField verticalHuggingPriority="750" id="82" customClass="NSTextField">
                                     <rect key="frame" x="5" y="20" width="167" height="14"/>
                                     <autoresizingMask key="autoresizingMask" widthSizable="YES"/>
                                     <textFieldCell key="cell" controlSize="small" lineBreakMode="truncatingTail" enabled="NO" sendsActionOnEndEditing="YES" title="^IDS_BOOKMARKS_NO_ITEMS" id="83">