Use output_all_resource_defines=false in most grd files.

extensions/extensions_strings.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--
   Strings for the extensions module. Used mostly for low-level error messages.
   Where possible new strings should be kept in Chrome and the extensions module
   should return an error code, message flag, etc.
 -->
 
 <grit latest_public_release="0" current_release="1"
-      source_lang_id="en" enc_check="möl">
+      output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/extensions_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="extensions_strings_am.pak" type="data_package" lang="am" />
     <output filename="extensions_strings_ar.pak" type="data_package" lang="ar" />
     <output filename="extensions_strings_bg.pak" type="data_package" lang="bg" />
     <output filename="extensions_strings_bn.pak" type="data_package" lang="bn" />
     <output filename="extensions_strings_ca.pak" type="data_package" lang="ca" />
     <output filename="extensions_strings_cs.pak" type="data_package" lang="cs" />
@@ skipping 314 matching lines @@
       <!-- Utility process names. Please keep alphabetized. -->
       <message name="IDS_UTILITY_PROCESS_EXTENSION_UNPACKER_NAME" desc="The name of the utility process used for unpacking extensions.">
         Extension Unpacker
       </message>
       <message name="IDS_UTILITY_PROCESS_MANIFEST_PARSER_NAME" desc="The name of the utility process used for parsing extension manifests.">
         Extension Manifest Parser
       </message>
     </messages>
   </release>
 </grit>