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

content/shell/renderer/layout_test/blink_test_runner.cc

Index: content/shell/renderer/layout_test/blink_test_runner.cc
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index 147d4d70dd3a497f02cd0ec42694613051ce0de6..93d19f580f9037f0eedb85ee5d6b4bdc8c036fac 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -29,13 +29,11 @@
 #include "base/values.h"
 #include "build/build_config.h"
 #include "components/plugins/renderer/plugin_placeholder.h"
-#include "components/test_runner/app_banner_client.h"
 #include "components/test_runner/gamepad_controller.h"
 #include "components/test_runner/layout_dump.h"
 #include "components/test_runner/layout_dump_flags.h"
 #include "components/test_runner/mock_screen_orientation_client.h"
 #include "components/test_runner/test_interfaces.h"
-#include "components/test_runner/tracked_dictionary.h"
 #include "components/test_runner/web_task.h"
 #include "components/test_runner/web_test_interfaces.h"
 #include "components/test_runner/web_test_proxy.h"
@@ -761,14 +759,6 @@ void BlinkTestRunner::DispatchBeforeInstallPromptEvent(
   callback.Run(reply == blink::WebAppBannerPromptReply::Cancel);
 }
 
-void BlinkTestRunner::ResolveBeforeInstallPromptPromise(
-      int request_id, const std::string& platform) {
-  test_runner::WebTestInterfaces* interfaces =
-      LayoutTestRenderProcessObserver::GetInstance()->test_interfaces();
-  if (interfaces->GetAppBannerClient())
-    interfaces->GetAppBannerClient()->ResolvePromise(request_id, platform);
-}
-
 blink::WebPlugin* BlinkTestRunner::CreatePluginPlaceholder(
     blink::WebLocalFrame* frame, const blink::WebPluginParams& params) {
   if (params.mimeType != "application/x-plugin-placeholder-test")