Convert utility process extension Unpacker IPC to mojo

extensions/browser/extensions_test.h

Index: extensions/browser/extensions_test.h
diff --git a/extensions/browser/extensions_test.h b/extensions/browser/extensions_test.h
index 1c2bf61061f7c6ac0b90c291dc04ac6217de8052..22a9c06a7c937d30a7ef98b8c99bdd45d543adb0 100644
--- a/extensions/browser/extensions_test.h
+++ b/extensions/browser/extensions_test.h
@@ -16,6 +16,7 @@
 
 namespace content {
 class BrowserContext;
+class ContentBrowserClient;
 class ContentUtilityClient;
 class RenderViewHostTestEnabler;
 }
@@ -52,6 +53,7 @@ class ExtensionsTest : public testing::Test {
 
  private:
   content::TestContentClientInitializer content_client_initializer_;
+  std::unique_ptr<content::ContentBrowserClient> content_browser_client_;
   std::unique_ptr<content::ContentUtilityClient> content_utility_client_;
   std::unique_ptr<content::BrowserContext> browser_context_;
   std::unique_ptr<TestExtensionsBrowserClient> extensions_browser_client_;