Cleanup: Better constify some strings in base.

base/metrics/field_trial_unittest.cc

Index: base/metrics/field_trial_unittest.cc
diff --git a/base/metrics/field_trial_unittest.cc b/base/metrics/field_trial_unittest.cc
index b474ddb186df91eacb5c59e5b1631890c73a9ba0..5080d65db55b62981d7ec73d7759d693336e2a2b 100644
--- a/base/metrics/field_trial_unittest.cc
+++ b/base/metrics/field_trial_unittest.cc
@@ -78,8 +78,8 @@ class FieldTrialTest : public testing::Test {
 // Test registration, and also check that destructors are called for trials
 // (and that Valgrind doesn't catch us leaking).
 TEST_F(FieldTrialTest, Registration) {
-  const char* name1 = "name 1 test";
-  const char* name2 = "name 2 test";
+  const char name1[] = "name 1 test";
+  const char name2[] = "name 2 test";
   EXPECT_FALSE(FieldTrialList::Find(name1));
   EXPECT_FALSE(FieldTrialList::Find(name2));