Fix Issue 1320: LiveEdit: text differencer fails with out of memory on large files

test/cctest/test-liveedit.cc

Index: test/cctest/test-liveedit.cc
diff --git a/test/cctest/test-liveedit.cc b/test/cctest/test-liveedit.cc
index 1086af0c9b8d2c5484f125796dd81500a0ca25a6..11d20eaaadca98a8ec68ff2f4d6aaa71b5f75ebc 100644
--- a/test/cctest/test-liveedit.cc
+++ b/test/cctest/test-liveedit.cc
@@ -95,12 +95,18 @@ void CompareStringsOneWay(const char* s1, const char* s2,
                           int expected_diff_parameter = -1) {
   StringCompareInput input(s1, s2);
 
-  ZoneScope zone_scope(Isolate::Current(), DELETE_ON_EXIT);
+  Isolate* isolate = Isolate::Current();
+  ZoneScope zone_scope(isolate, DELETE_ON_EXIT);
 
   DiffChunkStruct* first_chunk;
   ListDiffOutputWriter writer(&first_chunk);
 
-  Comparator::CalculateDifference(&input, &writer);
+  {
+    MaybeObject* maybe_result =
+        Comparator::CalculateDifference(&input, &writer, isolate);
+    ASSERT_EQ(maybe_result->IsFailure(), false);
+    USE(maybe_result);
+  }
 
   int len1 = StrLength(s1);
   int len2 = StrLength(s2);