Use custom scrollbars for print preview on non-retina mac displays.

chrome/browser/resources/component_extension_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This comment is only here because changes to resources are not picked up
      without changes to the corresponding grd file.  -->
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/component_extension_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="grit/component_extension_resources_map.cc" type="resource_file_map_source" />
     <output filename="grit/component_extension_resources_map.h" type="resource_map_header" />
@@ skipping 160 matching lines @@
         <include name="IDR_PDF_INDEX_MATERIAL_HTML" file="pdf/index-material.html" allowexternalscript="true" type="BINDATA" />
         <include name="IDR_PDF_MAIN_JS" file="pdf/main.js" type="BINDATA" />
         <include name="IDR_PDF_PDF_JS" file="pdf/pdf.js" type="BINDATA" />
         <include name="IDR_PDF_UI_MANAGER_JS" file="pdf/ui_manager.js" type="BINDATA" />
         <include name="IDR_PDF_VIEWPORT_JS" file="pdf/viewport.js" type="BINDATA" />
         <include name="IDR_PDF_OPEN_PDF_PARAMS_PARSER_JS" file="pdf/open_pdf_params_parser.js" type="BINDATA" />
         <include name="IDR_PDF_NAVIGATOR_JS" file="pdf/navigator.js" type="BINDATA" />
         <include name="IDR_PDF_VIEWPORT_SCROLLER_JS" file="pdf/viewport_scroller.js" type="BINDATA" />
         <include name="IDR_PDF_PDF_SCRIPTING_API_JS" file="pdf/pdf_scripting_api.js" type="BINDATA" />
         <include name="IDR_PDF_CONTENT_SCRIPT_JS" file="pdf/content_script.js" type="BINDATA" />
+        <if expr="is_macosx">
+          <include name="IDR_PDF_SCROLLBARS_CSS" file="pdf/scrollbars-mac.css" allowexternalscript="true" type="BINDATA" />

[Sam McNally, 2015/03/26 02:31:54]

scrollbars_mac.css

Remove allowexternalscript="true".

[raymes, 2015/03/26 04:30:34]

Done.

+        </if>
 
         <include name="IDR_PDF_VIEWER_BOOKMARK_CSS" file="pdf/elements/viewer-bookmark/viewer-bookmark.css" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_BOOKMARK_HTML" file="pdf/elements/viewer-bookmark/viewer-bookmark.html" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_BOOKMARK_JS" file="pdf/elements/viewer-bookmark/viewer-bookmark.js" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_BOOKMARKS_CONTENT_HTML" file="pdf/elements/viewer-bookmarks-content/viewer-bookmarks-content.html" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_BUTTON_CSS" file="pdf/elements/viewer-button/viewer-button.css" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_BUTTON_HTML" file="pdf/elements/viewer-button/viewer-button.html" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_BUTTON_JS" file="pdf/elements/viewer-button/viewer-button.js" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_ERROR_SCREEN_CSS" file="pdf/elements/viewer-error-screen/viewer-error-screen.css" type="BINDATA" />
         <include name="IDR_PDF_VIEWER_ERROR_SCREEN_HTML" file="pdf/elements/viewer-error-screen/viewer-error-screen.html" type="BINDATA" />
@@ skipping 95 matching lines @@
       <!-- The next two files have a .png extension since grit for some reason
            won't compile these files in if they are named .nmf/.pexe or
            anything remotely similar to their actual extension. Naming these
            .js or .html breaks all kinds of presubmit checks, hence .png seems
            to be the only viable option at the moment. -->
       <include name="IDR_WHISPERNET_PROXY_WHISPERNET_PROXY_PROXY_NMF" file="whispernet_proxy/whispernet_proxy.nmf.png" type="BINDATA" />
       <include name="IDR_WHISPERNET_PROXY_WHISPERNET_PROXY_PROXY_PEXE" file="whispernet_proxy/whispernet_proxy_pnacl.pexe.png" type="BINDATA" />
     </includes>
   </release>
 </grit>