Remove superfluous 'extern' variable that was causing a warning with clang.

llvm-svn: 91552
diff --git a/llvm/utils/unittest/googletest/gtest.cc b/llvm/utils/unittest/googletest/gtest.cc
index e46e90a..b5a654f 100644
--- a/llvm/utils/unittest/googletest/gtest.cc
+++ b/llvm/utils/unittest/googletest/gtest.cc
@@ -532,7 +532,7 @@
 
 // The value of GetTestTypeId() as seen from within the Google Test
 // library.  This is solely for testing GetTestTypeId().
-extern const TypeId kTestTypeIdInGoogleTest = GetTestTypeId();
+const TypeId kTestTypeIdInGoogleTest = GetTestTypeId();
 
 // This predicate-formatter checks that 'results' contains a test part
 // failure of the given type and that the failure message contains the