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..f1e3f7b7880b1b74b97a70bed9ab63201e4262c7 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;
@@ -193,6 +194,7 @@ class RenderViewHostTestEnabler {
   std::unique_ptr<MockRenderProcessHostFactory> rph_factory_;
   std::unique_ptr<TestRenderViewHostFactory> rvh_factory_;
   std::unique_ptr<TestRenderFrameHostFactory> rfh_factory_;
+  std::unique_ptr<LoaderGlobals> loader_globals_;
 };
 
 // RenderViewHostTestHarness ---------------------------------------------------
@@ -292,6 +294,9 @@ 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);