Reduce/remove usage of BrowserThread in content/browser/loader.

content/public/test/test_renderer_host.h

Index: content/public/test/test_renderer_host.h
diff --git a/content/public/test/test_renderer_host.h b/content/public/test/test_renderer_host.h
index 8dc63b8110928a313354ba2371e5ed27ab56caf7..02d7fd254377056605d815c4932c7318a54d50fe 100644
--- a/content/public/test/test_renderer_host.h
+++ b/content/public/test/test_renderer_host.h
@@ -40,6 +40,7 @@ namespace content {
 
 class BrowserContext;
 class ContentBrowserSanityChecker;
+class LoaderGlobals;
 class MockRenderProcessHost;
 class MockRenderProcessHostFactory;
 class NavigationController;
@@ -292,6 +293,9 @@ class RenderViewHostTestHarness : public testing::Test {
   std::unique_ptr<aura::test::AuraTestHelper> aura_test_helper_;
 #endif
   std::unique_ptr<RenderViewHostTestEnabler> rvh_test_enabler_;
+
+  std::unique_ptr<LoaderGlobals> loader_globals_;
+
   RenderProcessHostFactory* factory_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostTestHarness);