Add base namespace to more values in sync and elsewhere.

sync/internal_api/js_mutation_event_observer_unittest.cc

Index: sync/internal_api/js_mutation_event_observer_unittest.cc
diff --git a/sync/internal_api/js_mutation_event_observer_unittest.cc b/sync/internal_api/js_mutation_event_observer_unittest.cc
index b14cb81c63f8828fcfb7f81d0084b25cba95beda..4f449cfa562ae0aabe77cffe642d2e248904cb48 100644
--- a/sync/internal_api/js_mutation_event_observer_unittest.cc
+++ b/sync/internal_api/js_mutation_event_observer_unittest.cc
@@ -70,10 +70,10 @@ TEST_F(JsMutationEventObserverTest, OnChangesApplied) {
   for (int i = AUTOFILL_PROFILE; i < MODEL_TYPE_COUNT; ++i) {
     const std::string& model_type_str =
         ModelTypeToString(ModelTypeFromInt(i));
-    DictionaryValue expected_details;
+    base::DictionaryValue expected_details;
     expected_details.SetString("modelType", model_type_str);
     expected_details.SetString("writeTransactionId", "0");
-    ListValue* expected_changes = new ListValue();
+    base::ListValue* expected_changes = new base::ListValue();
     expected_details.Set("changes", expected_changes);
     for (int j = i; j < MODEL_TYPE_COUNT; ++j) {
       expected_changes->Append(changes[j].ToValue());
@@ -98,7 +98,7 @@ TEST_F(JsMutationEventObserverTest, OnChangesComplete) {
   InSequence dummy;
 
   for (int i = FIRST_REAL_MODEL_TYPE; i < MODEL_TYPE_COUNT; ++i) {
-    DictionaryValue expected_details;
+    base::DictionaryValue expected_details;
     expected_details.SetString(
         "modelType",
         ModelTypeToString(ModelTypeFromInt(i)));