TestInterfaces to chromium c++ style, rename methods and remove un-used header.

Changes:
1) Run clang-format through source and header files.
2) Rename data member variables to use unix_hacker_ style.
3) Rename methods to use CamelCase style.
4) Rename file name to test_interfaces.
5) Rename methods testRunner, eventSender and accessibilityController to
   GetTestRunner, GetEventSender and GetAccessibilityController respectively.
6) Removed un-used test_interfaces header.

BUG=331299

Review URL: https://codereview.chromium.org/458723002

Cr-Commit-Position: refs/heads/master@{#288768}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288768 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/shell/BUILD.gn b/content/shell/BUILD.gn
index 7e18991f..22df868 100644
--- a/content/shell/BUILD.gn
+++ b/content/shell/BUILD.gn
@@ -125,8 +125,6 @@
     "renderer/shell_render_process_observer.h",
     "renderer/shell_render_view_observer.cc",
     "renderer/shell_render_view_observer.h",
-    "renderer/test_runner/TestInterfaces.cpp",
-    "renderer/test_runner/TestInterfaces.h",
     "renderer/test_runner/TestPlugin.cpp",
     "renderer/test_runner/TestPlugin.h",
     "renderer/test_runner/WebTask.cpp",
@@ -178,6 +176,8 @@
     "renderer/test_runner/spell_check_client.h",
     "renderer/test_runner/test_common.cc",
     "renderer/test_runner/test_common.h",
+    "renderer/test_runner/test_interfaces.cc",
+    "renderer/test_runner/test_interfaces.h",
     "renderer/test_runner/test_runner.cc",
     "renderer/test_runner/test_runner.h",
     "renderer/test_runner/text_input_controller.cc",