Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/extensions/api/declarative/rules_registry_service_unittest.cc

Index: chrome/browser/extensions/api/declarative/rules_registry_service_unittest.cc
diff --git a/chrome/browser/extensions/api/declarative/rules_registry_service_unittest.cc b/chrome/browser/extensions/api/declarative/rules_registry_service_unittest.cc
index b0c4b93fd74706e6331dc048fcda57c27354ae4a..baa4bc5a364bee881d0da756f03946211e2ec82e 100644
--- a/chrome/browser/extensions/api/declarative/rules_registry_service_unittest.cc
+++ b/chrome/browser/extensions/api/declarative/rules_registry_service_unittest.cc
@@ -9,6 +9,7 @@
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread.h"
 #include "extensions/browser/api/declarative/test_rules_registry.h"
@@ -51,7 +52,7 @@ class RulesRegistryServiceTest : public testing::Test {
 
   void TearDown() override {
     // Make sure that deletion traits of all registries are executed.
-    message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
  protected:
@@ -99,7 +100,7 @@ TEST_F(RulesRegistryServiceTest, TestConstructionAndMultiThreading) {
       base::Bind(&VerifyNumberOfRules,
                  registry_service.GetRulesRegistry(key, "io"), 1));
 
-  message_loop_.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 
   // Test extension uninstalling.
   std::unique_ptr<base::DictionaryValue> manifest =
@@ -124,7 +125,7 @@ TEST_F(RulesRegistryServiceTest, TestConstructionAndMultiThreading) {
       base::Bind(&VerifyNumberOfRules,
                  registry_service.GetRulesRegistry(key, "io"), 0));
 
-  message_loop_.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace extensions