Replace RE2 import with a dependency

third_party/re2/lib/git/commit-msg.hook

Index: third_party/re2/lib/git/commit-msg.hook
diff --git a/third_party/re2/lib/git/commit-msg.hook b/third_party/re2/lib/git/commit-msg.hook
deleted file mode 100755
index 985016b5b6887cf4352aa55349c379e20c8697e8..0000000000000000000000000000000000000000
--- a/third_party/re2/lib/git/commit-msg.hook
+++ /dev/null
@@ -1,104 +0,0 @@
-#!/bin/sh
-# From Gerrit Code Review 2.2.1
-#
-# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
-#
-# Copyright (C) 2009 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-CHANGE_ID_AFTER="Bug|Issue"
-MSG="$1"
-
-# Check for, and add if missing, a unique Change-Id
-#
-add_ChangeId() {
-	clean_message=`sed -e '
-		/^diff --git a\/.*/{
-			s///
-			q
-		}
-		/^Signed-off-by:/d
-		/^#/d
-	' "$MSG" | git stripspace`
-	if test -z "$clean_message"
-	then
-		return
-	fi
-
-	if grep -i '^Change-Id:' "$MSG" >/dev/null
-	then
-		return
-	fi
-
-	id=`_gen_ChangeId`
-	perl -e '
-		$MSG = shift;
-		$id = shift;
-		$CHANGE_ID_AFTER = shift;
-
-		undef $/;
-		open(I, $MSG); $_ = <I>; close I;
-		s|^diff --git a/.*||ms;
-		s|^#.*$||mg;
-		exit unless $_;
-
-		@message = split /\n/;
-		$haveFooter = 0;
-		$startFooter = @message;
-		for($line = @message - 1; $line >= 0; $line--) {
-			$_ = $message[$line];
-
-			if (/^[a-zA-Z0-9-]+:/ && !m,^[a-z0-9-]+://,) {
-				$haveFooter++;
-				next;
-			}
-			next if /^[ []/;
-			$startFooter = $line if ($haveFooter && /^\r?$/);
-			last;
-		}
-
-		@footer = @message[$startFooter+1..@message];
-		@message = @message[0..$startFooter];
-		push(@footer, "") unless @footer;
-
-		for ($line = 0; $line < @footer; $line++) {
-			$_ = $footer[$line];
-			next if /^($CHANGE_ID_AFTER):/i;
-			last;
-		}
-		splice(@footer, $line, 0, "Change-Id: I$id");
-
-		$_ = join("\n", @message, @footer);
-		open(O, ">$MSG"); print O; close O;
-	' "$MSG" "$id" "$CHANGE_ID_AFTER"
-}
-_gen_ChangeIdInput() {
-	echo "tree `git write-tree`"
-	if parent=`git rev-parse HEAD^0 2>/dev/null`
-	then
-		echo "parent $parent"
-	fi
-	echo "author `git var GIT_AUTHOR_IDENT`"
-	echo "committer `git var GIT_COMMITTER_IDENT`"
-	echo
-	printf '%s' "$clean_message"
-}
-_gen_ChangeId() {
-	_gen_ChangeIdInput |
-	git hash-object -t commit --stdin
-}
-
-
-add_ChangeId