remove remaining uses of default isolate in tests

test/cctest/test-log.cc

Index: test/cctest/test-log.cc
diff --git a/test/cctest/test-log.cc b/test/cctest/test-log.cc
index 6a1f0395476fb8780fd30833ce3c6254bbb3ea74..2cf2a77445bb1b5a1934e2f10db90643e48fbb6e 100644
--- a/test/cctest/test-log.cc
+++ b/test/cctest/test-log.cc
@@ -326,7 +326,7 @@ static void ObjMethod1(const v8::FunctionCallbackInfo<v8::Value>& args) {
 }
 
 
-UNINITIALIZED_TEST(LogCallbacks) {
+TEST(LogCallbacks) {
   ScopedLoggerInitializer initialize_logger;
   Logger* logger = initialize_logger.logger();
 
@@ -375,7 +375,7 @@ static void Prop2Getter(v8::Local<v8::String> property,
 }
 
 
-UNINITIALIZED_TEST(LogAccessorCallbacks) {
+TEST(LogAccessorCallbacks) {
   ScopedLoggerInitializer initialize_logger;
   Logger* logger = initialize_logger.logger();
 
@@ -422,7 +422,7 @@ typedef i::NativesCollection<i::TEST> TestSources;
 
 // Test that logging of code create / move events is equivalent to traversal of
 // a resulting heap.
-UNINITIALIZED_TEST(EquivalenceOfLoggingAndTraversal) {
+TEST(EquivalenceOfLoggingAndTraversal) {
   // This test needs to be run on a "clean" V8 to ensure that snapshot log
   // is loaded. This is always true when running using tools/test.py because
   // it launches a new cctest instance for every test. To be sure that launching