Fix warnings on Win64.

test/cctest/test-log-utils.cc

Index: test/cctest/test-log-utils.cc
diff --git a/test/cctest/test-log-utils.cc b/test/cctest/test-log-utils.cc
index a08a0a1101c111fc2c677cb1878d8b484be8cad4..c99d770d42a105d492d28e2580c9b094eed54fe5 100644
--- a/test/cctest/test-log-utils.cc
+++ b/test/cctest/test-log-utils.cc
@@ -16,6 +16,7 @@ using v8::internal::LogRecordCompressor;
 using v8::internal::MutableCStrVector;
 using v8::internal::ScopedVector;
 using v8::internal::Vector;
+using v8::internal::StrLength;
 
 // Fills 'ref_buffer' with test data: a sequence of two-digit
 // hex numbers: '0001020304...'. Then writes 'ref_buffer' contents to 'dynabuf'.
@@ -118,7 +119,7 @@ TEST(DynaBufReadTruncation) {
 
 TEST(DynaBufSealing) {
   const char* seal = "Sealed";
-  const int seal_size = strlen(seal);
+  const int seal_size = StrLength(seal);
   LogDynamicBuffer dynabuf(32, 128, seal, seal_size);
   EmbeddedVector<char, 100> ref_buf;
   WriteData(&dynabuf, &ref_buf);