Make DataUseTabModel and DataUseMatcher more independent

chrome/browser/android/data_usage/data_use_ui_tab_model_unittest.cc

Index: chrome/browser/android/data_usage/data_use_ui_tab_model_unittest.cc
diff --git a/chrome/browser/android/data_usage/data_use_ui_tab_model_unittest.cc b/chrome/browser/android/data_usage/data_use_ui_tab_model_unittest.cc
index 5a00a686b418182cd86b8524958a7cb68581d4ec..7b43c6d14fc38e05a03e0f1912ed57e59e473047 100644
--- a/chrome/browser/android/data_usage/data_use_ui_tab_model_unittest.cc
+++ b/chrome/browser/android/data_usage/data_use_ui_tab_model_unittest.cc
@@ -66,9 +66,17 @@ class MockTabDataUseObserver : public DataUseTabModel::TabDataUseObserver {
 
 class TestDataUseTabModel : public DataUseTabModel {
  public:
-  TestDataUseTabModel() {}
+  TestDataUseTabModel()
+      : DataUseTabModel(base::Bind(&TestDataUseTabModel::FetchMatchingRules,
+                                   base::Unretained(this)),
+                        base::Bind(&TestDataUseTabModel::OnMatchingRulesFetched,
+                                   base::Unretained(this))) {}
   ~TestDataUseTabModel() override {}
 
+  void FetchMatchingRules() {}
+
+  void OnMatchingRulesFetched(bool is_valid) {}
+
   using DataUseTabModel::NotifyObserversOfTrackingStarting;
   using DataUseTabModel::NotifyObserversOfTrackingEnding;
 };
@@ -120,8 +128,6 @@ class DataUseUITabModelTest : public testing::Test {
     base::RunLoop().RunUntilIdle();
 
     data_use_tab_model_.reset(new TestDataUseTabModel());
-    data_use_tab_model_->InitOnUIThread(
-        external_data_use_observer_->external_data_use_observer_bridge_);
   }
 
   void SetUpDataUseUITabModel() {