Make callers of CommandLine use it via the base:: namespace.

rlz/test/rlz_unittest_main.cc

Index: rlz/test/rlz_unittest_main.cc
diff --git a/rlz/test/rlz_unittest_main.cc b/rlz/test/rlz_unittest_main.cc
index 2c6386cd72c445aee8f6e47b0a9e4e6f0dde52f5..9b73442ebbb188b73eb35d249e6ed5fd9f10eef0 100644
--- a/rlz/test/rlz_unittest_main.cc
+++ b/rlz/test/rlz_unittest_main.cc
@@ -18,7 +18,7 @@
 
 int main(int argc, char **argv) {
   base::AtExitManager at_exit;
-  CommandLine::Init(argc, argv);
+  base::CommandLine::Init(argc, argv);
 
   testing::InitGoogleMock(&argc, argv);
   testing::InitGoogleTest(&argc, argv);