Convert ContentMain to take a struct instead of parameters that vary depending on the platform.

content/public/test/test_launcher.cc

Index: content/public/test/test_launcher.cc
===================================================================
--- content/public/test/test_launcher.cc	(revision 255697)
+++ content/public/test/test_launcher.cc	(working copy)
@@ -439,22 +439,22 @@
 
 int RunContentMain(int argc, char** argv,
                    TestLauncherDelegate* launcher_delegate) {
+  scoped_ptr<ContentMainDelegate> chrome_main_delegate(
+      launcher_delegate->CreateContentMainDelegate());
+  ContentMainParams params(chrome_main_delegate.get());
+
 #if defined(OS_WIN)
   sandbox::SandboxInterfaceInfo sandbox_info = {0};
   InitializeSandboxInfo(&sandbox_info);
-  scoped_ptr<ContentMainDelegate> chrome_main_delegate(
-      launcher_delegate->CreateContentMainDelegate());
-  return ContentMain(GetModuleHandle(NULL),
-                     &sandbox_info,
-                     chrome_main_delegate.get());
+
+  params.instance = GetModuleHandle(NULL);
+  params.sandbox_info = &sandbox_info;
 #elif defined(OS_LINUX)
-  scoped_ptr<ContentMainDelegate> chrome_main_delegate(
-      launcher_delegate->CreateContentMainDelegate());
-  return ContentMain(argc, const_cast<const char**>(argv),
-                     chrome_main_delegate.get());
+  params.argc = argc;
+  params.argv = const_cast<const char**>(argv);
 #endif  // defined(OS_WIN)
-  NOTREACHED();
-  return 0;
+
+  return ContentMain(&params);
 }
 
 int LaunchTests(TestLauncherDelegate* launcher_delegate,