Add 'LOG=N' line to merge-to-branch.sh to avoid presubmit errors when merging to branch.

tools/merge-to-branch.sh

 #!/bin/bash
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 161 matching lines @@
   done
   for HASH in ${PATCH_COMMIT_HASHES[@]} ; do
     BUG=$(git log -1 $HASH | grep "BUG=" | awk -F '=' '{print $NF}')
     if [ -n "$BUG" ] ; then
       [[ -n "$BUG_AGGREGATE" ]] && BUG_AGGREGATE="$BUG_AGGREGATE,"
       BUG_AGGREGATE="$BUG_AGGREGATE$BUG"
     fi
   done
   if [ -n "$BUG_AGGREGATE" ] ; then
     echo "BUG=$BUG_AGGREGATE" >> $COMMITMSG_FILE
+    echo "LOG=N" >> $COMMITMSG_FILE
   fi
   persist "NEW_COMMIT_MSG"
   persist "REVISION_LIST"
   persist_patch_commit_hashes
 fi
 
 let CURRENT_STEP+=1
 if [ $START_STEP -le $CURRENT_STEP ] ; then
   echo ">>> Step $CURRENT_STEP: Apply patches for selected revisions."
   restore_if_unset "MERGE_TO_BRANCH"
@@ skipping 95 matching lines @@
   restore_version_if_unset "NEW"
   common_cleanup
   if [ $REVERT_FROM_BLEEDING_EDGE==0 ] ; then
     echo "*** SUMMARY ***"
     echo "version: $NEWMAJOR.$NEWMINOR.$NEWBUILD.$NEWPATCH"
     echo "branch: $TO_URL"
     echo "svn revision: $SVN_REVISION"
     [[ -n "$REVISION_LIST" ]] && echo "patches:$REVISION_LIST"
   fi
 fi