Spelling fixes e to i.

runtime/vm/object_test.cc

Index: runtime/vm/object_test.cc
diff --git a/runtime/vm/object_test.cc b/runtime/vm/object_test.cc
index c79ac6d0164f0815e11554227769222516e0e413..0e04a7e3151de69a296c6ea21a609ee920bb1b8e 100644
--- a/runtime/vm/object_test.cc
+++ b/runtime/vm/object_test.cc
@@ -1142,7 +1142,7 @@ ISOLATE_UNIT_TEST_CASE(StringConcat) {
     EXPECT(str6.Equals(two_one_two, two_one_two_len));
   }
 
-  // Concatenated emtpy and non-empty strings built from 4-byte elements.
+  // Concatenated empty and non-empty strings built from 4-byte elements.
   {
     const String& str1 = String::Handle(String::New(""));
     EXPECT(str1.IsOneByteString());