vp9_end_to_end_test: fix compile with gcc 4.8.5

use Values() rather than ValuesIn() with an initializer list as this
version of gcc under CentOS fails to deduce the type:

../third_party/googletest/src/include/gtest/gtest-param-test.h:304:29:
note:   template argument deduction/substitution failed:
../test/vp9_end_to_end_test.cc:346:59: note:   couldn't deduce template
parameter ‘T’
                            ::testing::ValuesIn({ 6, 7, 8 }));

Bug: webm:1690
Change-Id: I43d9d4777fcd74a4f8fa8bdcd9834cdca5e546ff
1 file changed