Enable features API for content shell and webview

content/browser/loader/resource_dispatcher_host_unittest.cc

Index: content/browser/loader/resource_dispatcher_host_unittest.cc
diff --git a/content/browser/loader/resource_dispatcher_host_unittest.cc b/content/browser/loader/resource_dispatcher_host_unittest.cc
index 3ccaffe0ae672602c25533074a2862fa9696eb32..c3cbb35379087937d7481a931ec2ab5045e865f5 100644
--- a/content/browser/loader/resource_dispatcher_host_unittest.cc
+++ b/content/browser/loader/resource_dispatcher_host_unittest.cc
@@ -943,7 +943,7 @@ class ResourceDispatcherHostTest : public testing::TestWithParam<TestConfig>,
     base::FeatureList::ClearInstanceForTesting();
     switch (GetParam()) {
       case TestConfig::kDefault:
-        base::FeatureList::InitializeInstance();
+        base::FeatureList::InitializeInstance(std::string(), std::string());
         break;
       case TestConfig::kOptimizeIPCForSmallResourceEnabled: {
         scoped_ptr<base::FeatureList> feature_list(new base::FeatureList);