WebTestInterfaces class to chromium c++ style.

BUG=331299

Review URL: https://codereview.chromium.org/595943002

Cr-Commit-Position: refs/heads/master@{#296667}
diff --git a/content/shell/BUILD.gn b/content/shell/BUILD.gn
index 44c338a..5efbf26 100644
--- a/content/shell/BUILD.gn
+++ b/content/shell/BUILD.gn
@@ -130,8 +130,6 @@
     "renderer/shell_render_process_observer.h",
     "renderer/shell_render_view_observer.cc",
     "renderer/shell_render_view_observer.h",
-    "renderer/test_runner/WebTestInterfaces.cpp",
-    "renderer/test_runner/WebTestInterfaces.h",
     "renderer/test_runner/accessibility_controller.cc",
     "renderer/test_runner/accessibility_controller.h",
     "renderer/test_runner/event_sender.cc",
@@ -194,6 +192,8 @@
     "renderer/test_runner/web_task.cc",
     "renderer/test_runner/web_task.h",
     "renderer/test_runner/web_test_delegate.h",
+    "renderer/test_runner/web_test_interfaces.cc",
+    "renderer/test_runner/web_test_interfaces.h",
     "renderer/test_runner/web_test_proxy.cc",
     "renderer/test_runner/web_test_proxy.h",
     "renderer/test_runner/web_test_runner.h",