Remove Roboto 300 weight from build

ui/webui/resources/webui_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/webui_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="grit/webui_resources_map.cc"
             type="resource_file_map_source" />
     <output filename="grit/webui_resources_map.h" type="resource_map_header" />
     <output filename="webui_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
     <includes>
       <include name="IDR_WEBUI_I18N_TEMPLATE_JS" file="js/i18n_template.js" flattenhtml="true" type="BINDATA" />
       <include name="IDR_WEBUI_JSTEMPLATE_JS" file="js/jstemplate_compiled.js" flattenhtml="true" type="BINDATA" />
       <include name="IDR_WEBUI_ANALYTICS_JS" file="js/analytics.js" flattenhtml="true" type="BINDATA" />
       <!-- Roboto Font. Roboto-Regular and Roboto-Light is already available on
            Android, and Roboto-Medium is not used on Android. -->
       <if expr="not android">
-        <include name="IDR_WEBUI_ROBOTO_ROBOTO_LIGHT_WOFF2" file="roboto/roboto-light.woff2" type="BINDATA" />
         <include name="IDR_WEBUI_ROBOTO_ROBOTO_REGULAR_WOFF2" file="roboto/roboto-regular.woff2" type="BINDATA" />
         <include name="IDR_WEBUI_ROBOTO_ROBOTO_MEDIUM_WOFF2" file="roboto/roboto-medium.woff2" type="BINDATA" />
       </if>
 
       <!-- Component apps common image resources - 1x -->
       <!-- White button -->
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON"
                file="../../views/resources/default_100_percent/common/button.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_PRESSED"
                file="../../views/resources/default_100_percent/common/button_pressed.png" type="BINDATA" />
@@ skipping 426 matching lines @@
                    file="js/chromeos/ui_account_tweaks.js"
                    type="chrome_html" />
       </if>
       <part file="cr_elements_resources.grdp" />
       <if expr="not is_android">
         <part file="polymer_resources.grdp" />
       </if>
     </structures>
   </release>
 </grit>