Use a different icon for the web store under Chromium than Google Chrome.

chrome/app/theme/theme_resources.grd

Index: chrome/app/theme/theme_resources.grd
diff --git a/chrome/app/theme/theme_resources.grd b/chrome/app/theme/theme_resources.grd
index 6dbc0a2790112252836938f30940aa9b8ea1c21d..1f066d925fe6344cc6a9b82404e14f8c462ddb9a 100644
--- a/chrome/app/theme/theme_resources.grd
+++ b/chrome/app/theme/theme_resources.grd
@@ -266,6 +266,7 @@
         <include name="IDR_PRODUCT_LOGO_16" file="google_chrome/product_logo_16.png" type="BINDATA" />
         <include name="IDR_PRODUCT_LOGO_WHITE" file="google_chrome/product_logo_white.png" type="BINDATA" />
         <include name="IDR_CUSTOM_PRODUCT_LOGO" file="google_chrome/alt_logo.gif" type="BINDATA" />
+        <include name="IDR_WEBSTORE_ICON" file="google_chrome/webstore_icon.png" type="BINDATA" />
       </if>
       <if expr="not pp_ifdef('_google_chrome')">
         <include name="IDR_PRODUCT_ICON_32" file="chromium/chromium_icon_32.png" type="BINDATA" />
@@ -273,6 +274,7 @@
         <include name="IDR_PRODUCT_LOGO_WHITE" file="chromium/product_logo_white.png" type="BINDATA" />
         <include name="IDR_PRODUCT_LOGO_16" file="chromium/product_logo_16.png" type="BINDATA" />
         <include name="IDR_CUSTOM_PRODUCT_LOGO" file="chromium/product_logo.png" type="BINDATA" />
+        <include name="IDR_WEBSTORE_ICON" file="chromium/webstore_icon.png" type="BINDATA" />
       </if>
       <!-- NOTE: product_logo_*.* files beyond what's listed above are
            referenced by installer code; don't remove them unless you know what