Extensions: Only load incognito-enabled extensions in an incognito renderer.

content/public/test/test_browser_context.h

Index: content/public/test/test_browser_context.h
diff --git a/content/public/test/test_browser_context.h b/content/public/test/test_browser_context.h
index 41af84b31d888ac9e399c7b0584fb46378383df0..397c7ee9954e2db6acf14bdf63048b8044118381 100644
--- a/content/public/test/test_browser_context.h
+++ b/content/public/test/test_browser_context.h
@@ -72,6 +72,19 @@ class TestBrowserContext : public BrowserContext {
   DISALLOW_COPY_AND_ASSIGN(TestBrowserContext);
 };
 
+// An incognito version of a TestBrowserContext.
+class TestBrowserContextIncognito : public TestBrowserContext {
+ public:
+  TestBrowserContextIncognito();
+  ~TestBrowserContextIncognito() override;
+
+  // TestBrowserContext implementation.
+  bool IsOffTheRecord() const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestBrowserContextIncognito);
+};
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_TEST_BROWSER_CONTEXT_H_