Mark content::TestBrowserContext as live in ExtensionsTest before use.

extensions/browser/extensions_test.cc

Index: extensions/browser/extensions_test.cc
diff --git a/extensions/browser/extensions_test.cc b/extensions/browser/extensions_test.cc
index f9f88a107396febf551987a681d23aa9ca11ae91..a6e300b762f7007a0291ae93e2f39389600beed4 100644
--- a/extensions/browser/extensions_test.cc
+++ b/extensions/browser/extensions_test.cc
@@ -28,6 +28,8 @@ ExtensionsTest::ExtensionsTest()
       browser_context_(new content::TestBrowserContext),
       extensions_browser_client_(
           new TestExtensionsBrowserClient(browser_context_.get())) {
+  BrowserContextDependencyManager::GetInstance()->MarkBrowserContextLive(
+      browser_context_.get());
   content::SetBrowserClientForTesting(content_browser_client_.get());
   content::SetUtilityClientForTesting(content_utility_client_.get());
   ExtensionsBrowserClient::Set(extensions_browser_client_.get());