Properly set up TestRenderFrameHost in DeclarativeChromeContentRulesRegistryTest.

chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry_unittest.cc

Index: chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry_unittest.cc
diff --git a/chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry_unittest.cc b/chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry_unittest.cc
index ad3be5b797d6af222ec71d4891a6b3ddccf02d26..e33493a66f21ccc798479ea101d8ca6893f36eea 100644
--- a/chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry_unittest.cc
+++ b/chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry_unittest.cc
@@ -15,6 +15,7 @@
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/frame_navigate_params.h"
+#include "content/public/test/test_web_contents_factory.h"
 #include "extensions/common/extension.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -135,6 +136,7 @@ class DeclarativeChromeContentRulesRegistryTest : public testing::Test {
 
  private:
   TestExtensionEnvironment env_;
+  content::TestWebContentsFactory factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DeclarativeChromeContentRulesRegistryTest);
 };