Fix testinstall.cc.

Change-Id: Id1760addd0b55ccb6d6bb9c2c8ef10a874f9bcd3
Reviewed-on: https://code-review.googlesource.com/5444
Reviewed-by: Paul Wankadia <junyer@google.com>
diff --git a/testinstall.cc b/testinstall.cc
index 97990c2..9f58fa2 100644
--- a/testinstall.cc
+++ b/testinstall.cc
@@ -12,9 +12,9 @@
 	FilteredRE2 f;
 	int id;
 	f.Add("a.*b.*c", RE2::DefaultOptions, &id);
-	vector<string> v;
+	std::vector<string> v;
 	f.Compile(&v);
-	vector<int> ids;
+	std::vector<int> ids;
 	f.FirstMatch("abbccc", ids);
 
 	if(RE2::FullMatch("axbyc", "a.*b.*c")) {