Fix warnings on Win64.

test/cctest/test-regexp.cc

Index: test/cctest/test-regexp.cc
diff --git a/test/cctest/test-regexp.cc b/test/cctest/test-regexp.cc
index 3b664a1cd4a37cc86475267187742bc24830b11f..6aa0730c0d776f9321f58cfd2692bd8d3feeadc8 100644
--- a/test/cctest/test-regexp.cc
+++ b/test/cctest/test-regexp.cc
@@ -74,7 +74,7 @@ static SmartPointer<const char> Parse(const char* input) {
 static bool CheckSimple(const char* input) {
   V8::Initialize(NULL);
   v8::HandleScope scope;
-  unibrow::Utf8InputBuffer<> buffer(input, strlen(input));
+  unibrow::Utf8InputBuffer<> buffer(input, StrLength(input));
   ZoneScope zone_scope(DELETE_ON_EXIT);
   FlatStringReader reader(CStrVector(input));
   RegExpCompileData result;
@@ -92,7 +92,7 @@ struct MinMaxPair {
 static MinMaxPair CheckMinMaxMatch(const char* input) {
   V8::Initialize(NULL);
   v8::HandleScope scope;
-  unibrow::Utf8InputBuffer<> buffer(input, strlen(input));
+  unibrow::Utf8InputBuffer<> buffer(input, StrLength(input));
   ZoneScope zone_scope(DELETE_ON_EXIT);
   FlatStringReader reader(CStrVector(input));
   RegExpCompileData result;