Implement default css for toolstrips.

chrome/browser/browser_resources.grd

Index: chrome/browser/browser_resources.grd
diff --git a/chrome/browser/browser_resources.grd b/chrome/browser/browser_resources.grd
index c85618158325749fe7f17e7664f036a958ea8af3..60f9cb5a835d0ccd60999db0664d623fec54259b 100644
--- a/chrome/browser/browser_resources.grd
+++ b/chrome/browser/browser_resources.grd
@@ -23,7 +23,8 @@
       <include name="IDR_CREDITS_HTML" file="resources\about_credits.html" flattenhtml="true" type="BINDATA" />
       <include name="IDR_HISTORY_HTML" file="resources\history.html" flattenhtml="true" type="BINDATA" />
       <include name="IDR_DOWNLOADS_HTML" file="resources\downloads.html" flattenhtml="true" type="BINDATA" />
-      <include name="IDR_EXTENSIONS_HTML" file="resources\extensions.html" flattenhtml="true" type="BINDATA" />
+      <include name="IDR_EXTENSIONS_UI_HTML" file="resources\extensions_ui.html" flattenhtml="true" type="BINDATA" />
+      <include name="IDR_EXTENSIONS_TOOLSTRIP_CSS" file="resources\extensions_toolstrip.css" flattenhtml="true" type="BINDATA" />
       <if expr="os == 'linux2'">
         <include name="IDR_LINUX_SPLASH_HTML" file="resources\linux-splash.html" flattenhtml="true" type="BINDATA" />
       </if>