Revert "(GH-14) Fix inconsistency in PPI::Token::HereDoc->heredoc()."

This reverts commit 49b2c9b.

Upon further investigation, I found that the issue is not in PPI but in the
test cases in this module. I will commit a fix for those separately, but I am
reverting the PPI workaround and I have cancelled the PPI pull request
accordingly.

Author: guillaumeaubert

lib/Perl/Critic/Policy/ValuesAndExpressions/PreventSQLInjection.pm

@@ -413,17 +413,6 @@ sub get_token_content
 	if ( $token->isa('PPI::Token::HereDoc') )
 	{
 		my @heredoc = $token->heredoc();
-
-		# Due to a bug in PPI::Token::Heredoc, $token->heredoc():
-		#    - does not include the terminator line when the terminator is a simple
-		#      bareword;
-		#    - includes the terminator line in the other cases (single/double
-		#      quoted , commands, escaped).
-		# See https://github.com/adamkennedy/PPI/pull/71, but in the meantime this
-		# addresses the inconsistency:
-		pop( @heredoc )
-			if $token->content() =~ /^\<\<['"`\\]/;
-
 		$content = join( '', @heredoc );
 	}
 	elsif ( $token->isa('PPI::Token::Quote' ) )