MD History: increase contrast in synced tab promo flourish plant

chrome/browser/browser_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1" output_all_resource_defines="false">
   <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 239 matching lines @@
 
       <if expr="not is_android and not is_ios">
         <!-- MD Bookmarks. -->
         <include name="IDR_MD_BOOKMARKS_BOOKMARKS_HTML" file="resources\md_bookmarks\bookmarks.html" type="BINDATA" />
 
         <!-- MD History. -->
         <include name="IDR_MD_HISTORY_CONSTANTS_HTML" file="resources\md_history\constants.html" type="BINDATA" />
         <include name="IDR_MD_HISTORY_CONSTANTS_JS" file="resources\md_history\constants.js" type="BINDATA" />
         <include name="IDR_MD_HISTORY_HISTORY_HTML" file="resources\md_history\history.html" flattenhtml="true" type="BINDATA" />
         <include name="IDR_MD_HISTORY_HISTORY_JS" file="resources\md_history\history.js" type="BINDATA" />
-        <include name="IDR_MD_HISTORY_IMAGES_100_SIGN_IN_PROMO_PNG" file="resources\md_history\images\100\sign_in_promo.png" type="BINDATA" />
-        <include name="IDR_MD_HISTORY_IMAGES_200_SIGN_IN_PROMO_PNG" file="resources\md_history\images\200\sign_in_promo.png" type="BINDATA" />
+        <include name="IDR_MD_HISTORY_IMAGES_100_SIGN_IN_PROMO_JPG" file="resources\md_history\images\100\sign_in_promo.jpg" type="BINDATA" />
+        <include name="IDR_MD_HISTORY_IMAGES_200_SIGN_IN_PROMO_JPG" file="resources\md_history\images\200\sign_in_promo.jpg" type="BINDATA" />
         <if expr="use_vulcanize">
           <then>
             <include name="IDR_MD_HISTORY_APP_VULCANIZED_HTML" file="resources\md_history\app.vulcanized.html" flattenhtml="true" allowexternalscript="true" type="BINDATA" />
             <include name="IDR_MD_HISTORY_APP_CRISPER_JS" file="resources\md_history\app.crisper.js" flattenhtml="true" allowexternalscript="true" type="BINDATA" />
             <include name="IDR_MD_HISTORY_LAZY_LOAD_VULCANIZED_HTML" file="resources\md_history\lazy_load.vulcanized.html" allowexternalscript="true" type="BINDATA" />
             <include name="IDR_MD_HISTORY_LAZY_LOAD_CRISPER_JS" file="resources\md_history\lazy_load.crisper.js" allowexternalscript="true" type="BINDATA" />
           </then>
           <else>
             <include name="IDR_MD_HISTORY_APP_HTML" file="resources\md_history\app.html" type="BINDATA" />
             <include name="IDR_MD_HISTORY_APP_JS" file="resources\md_history\app.js" type="BINDATA" />
@@ skipping 336 matching lines @@
         <include name="IDR_IME_WINDOW_CLOSE_H" file="resources\input_ime\ime_window_close_hover.png" type="BINDATA" />
       </if>
       <include name="IDR_CHROME_CONTENT_BROWSER_MANIFEST_OVERLAY" file="${root_gen_dir}\chrome_content_browser_manifest_overlay.json" use_base_dir="false" type="BINDATA" />
       <include name="IDR_CHROME_CONTENT_GPU_MANIFEST_OVERLAY" file="chrome_content_gpu_manifest_overlay.json" type="BINDATA" />
       <include name="IDR_CHROME_CONTENT_PLUGIN_MANIFEST_OVERLAY" file="chrome_content_plugin_manifest_overlay.json" type="BINDATA" />
       <include name="IDR_CHROME_CONTENT_RENDERER_MANIFEST_OVERLAY" file="chrome_content_renderer_manifest_overlay.json" type="BINDATA" />
       <include name="IDR_CHROME_CONTENT_UTILITY_MANIFEST_OVERLAY" file="chrome_content_utility_manifest_overlay.json" type="BINDATA" />
     </includes>
   </release>
 </grit>