Make test_runner::AppBannerClient an internal detail of components/test_runner.

components/test_runner/web_test_delegate.h

Index: components/test_runner/web_test_delegate.h
diff --git a/components/test_runner/web_test_delegate.h b/components/test_runner/web_test_delegate.h
index f43ef13c6c162b90b969f342cf1fe90dc5638cb1..a935d87f25fc5ebb8a13f49ba676c3932e156245 100644
--- a/components/test_runner/web_test_delegate.h
+++ b/components/test_runner/web_test_delegate.h
@@ -279,14 +279,6 @@ class WebTestDelegate {
       const std::vector<std::string>& event_platforms,
       const base::Callback<void(bool)>& callback) = 0;
 
-  // Resolve the promise associated with the beforeinstallprompt even with
-  // request id |request_id|. The promise is resolved with a result.platform set
-  // to |platform|. If |platform| is not empty, result.outcome will be
-  // 'accepted', otherwise it will be 'dismissed'.
-  virtual void ResolveBeforeInstallPromptPromise(
-      int request_id,
-      const std::string& platform) = 0;
-
   virtual blink::WebPlugin* CreatePluginPlaceholder(
     blink::WebLocalFrame* frame,
     const blink::WebPluginParams& params) = 0;