Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/metrics/metrics_log_unittest.cc

Index: chrome/browser/metrics/metrics_log_unittest.cc
diff --git a/chrome/browser/metrics/metrics_log_unittest.cc b/chrome/browser/metrics/metrics_log_unittest.cc
index a1a102373e24f51c06b61361ed84e27130d9d26c..bd39ea00db772ddad732653cb50ba3fb3b43c5df 100644
--- a/chrome/browser/metrics/metrics_log_unittest.cc
+++ b/chrome/browser/metrics/metrics_log_unittest.cc
@@ -382,7 +382,7 @@ TEST_F(MetricsLogTest, Plugins) {
   EXPECT_FALSE(system_profile.plugin(1).is_pepper());
 
   // Now set some plugin stability stats for p2 and verify they're recorded.
-  scoped_ptr<base::DictionaryValue> plugin_dict(new DictionaryValue);
+  scoped_ptr<base::DictionaryValue> plugin_dict(new base::DictionaryValue);
   plugin_dict->SetString(prefs::kStabilityPluginName, "p2");
   plugin_dict->SetInteger(prefs::kStabilityPluginLaunches, 1);
   plugin_dict->SetInteger(prefs::kStabilityPluginCrashes, 2);