Remove one thread hop while fetching matching rules

chrome/browser/android/data_usage/data_use_matcher_unittest.cc

Index: chrome/browser/android/data_usage/data_use_matcher_unittest.cc
diff --git a/chrome/browser/android/data_usage/data_use_matcher_unittest.cc b/chrome/browser/android/data_usage/data_use_matcher_unittest.cc
index 318e5194996b122b5f97c3d9fe991f1a03820ace..f109d5d80ea74e6b0084525a98286ae62674727b 100644
--- a/chrome/browser/android/data_usage/data_use_matcher_unittest.cc
+++ b/chrome/browser/android/data_usage/data_use_matcher_unittest.cc
@@ -16,7 +16,7 @@
 #include "base/test/histogram_tester.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
-#include "chrome/browser/android/data_usage/external_data_use_observer.h"
+#include "chrome/browser/android/data_usage/external_data_use_observer_bridge.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -56,6 +56,14 @@ class NowTestTickClock : public base::TickClock {
   DISALLOW_COPY_AND_ASSIGN(NowTestTickClock);
 };
 
+class TestExternalDataUseObserverBridge
+    : public chrome::android::ExternalDataUseObserverBridge {
+ public:
+  TestExternalDataUseObserverBridge() {}
+  void FetchMatchingRules() const override {}
+  void ShouldRegisterAsDataUseObserver(bool should_register) const override{};
+};
+
 }  // namespace
 
 namespace chrome {
@@ -69,9 +77,7 @@ class DataUseMatcherTest : public testing::Test {
   DataUseMatcherTest()
       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
         data_use_matcher_(base::WeakPtr<DataUseTabModel>(),
-                          content::BrowserThread::GetMessageLoopProxyForThread(
-                              content::BrowserThread::IO),
-                          base::WeakPtr<ExternalDataUseObserver>(),
+                          new TestExternalDataUseObserverBridge(),
                           base::TimeDelta::FromSeconds(
                               kDefaultMatchingRuleExpirationDurationSeconds)) {}