Deleting the copresence API.

chrome/browser/browser_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/browser_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="browser_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
     <structures>
@@ skipping 80 matching lines @@
       <include name="IDR_AD_NETWORK_HASHES" file="resources\ad_networks.dat" type="BINDATA" />
       <include name="IDR_BOOKMARKS_MANIFEST" file="resources\bookmark_manager\manifest.json" type="BINDATA" />
       <if expr="is_posix and not is_macosx and not is_ios">
         <include name="IDR_CERTIFICATE_VIEWER_HTML" file="resources\certificate_viewer.html" type="BINDATA" />
         <include name="IDR_CERTIFICATE_VIEWER_JS" file="resources\certificate_viewer.js" type="BINDATA" />
         <include name="IDR_CERTIFICATE_VIEWER_CSS" file="resources\certificate_viewer.css" type="BINDATA" />
       </if>
       <if expr="enable_app_list">
         <include name="IDR_CHROME_APP_MANIFEST" file="resources\chrome_app\manifest.json" type="BINDATA" />
       </if>
-      <if expr="not is_android and not is_ios">
-        <include name="IDR_COPRESENCE_CSS" file="resources\copresence.css" type="BINDATA" />
-        <include name="IDR_COPRESENCE_HTML" file="resources\copresence.html" type="BINDATA" />
-        <include name="IDR_COPRESENCE_JS" file="resources\copresence.js" type="BINDATA" />
-      </if>
       <if expr="enable_printing">
         <include name="IDR_CLOUDPRINT_MANIFEST" file="resources\cloud_print_app\manifest.json" type="BINDATA" />
       </if>
       <if expr="not is_ios">
         <include name="IDR_DEVTOOLS_DISCOVERY_PAGE_HTML" file="devtools\frontend\devtools_discovery_page.html" type="BINDATA"/>
       </if>
       <include name="IDR_DOMAIN_RELIABILITY_INTERNALS_HTML" file="resources\domain_reliability_internals.html" compress="gzip" type="BINDATA" />
       <include name="IDR_DOMAIN_RELIABILITY_INTERNALS_CSS" file="resources\domain_reliability_internals.css" compress="gzip" type="BINDATA" />
       <include name="IDR_DOMAIN_RELIABILITY_INTERNALS_JS" file="resources\domain_reliability_internals.js" compress="gzip" type="BINDATA" />
       <include name="IDR_DOWNLOAD_FILE_TYPES_PB" file="${root_gen_dir}\chrome\browser\resources\safe_browsing\download_file_types.pb" use_base_dir="false" type="BINDATA" />
@@ skipping 429 matching lines @@
         <include name="IDR_CAST_FAVICON" file="resources\cast\cast_favicon.ico" type="BINDATA" />
       </if>
       <if expr="not is_android and not is_ios and not chromeos">
         <include name="IDR_IME_WINDOW_CLOSE" file="resources\input_ime\ime_window_close.png" type="BINDATA" />
         <include name="IDR_IME_WINDOW_CLOSE_C" file="resources\input_ime\ime_window_close_click.png" type="BINDATA" />
         <include name="IDR_IME_WINDOW_CLOSE_H" file="resources\input_ime\ime_window_close_hover.png" type="BINDATA" />
       </if>
     </includes>
   </release>
 </grit>