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

chrome/app/chrome_main.cc

Index: chrome/app/chrome_main.cc
===================================================================
--- chrome/app/chrome_main.cc	(revision 255697)
+++ chrome/app/chrome_main.cc	(working copy)
@@ -26,16 +26,28 @@
 #if defined(OS_WIN)
 DLLEXPORT int __cdecl ChromeMain(HINSTANCE instance,
                                  sandbox::SandboxInterfaceInfo* sandbox_info) {
+#else
+int ChromeMain(int argc, const char** argv) {
+#endif
+  ChromeMainDelegate chrome_main_delegate;
+  content::ContentMainParams params(&chrome_main_delegate);
+
+#if defined(OS_WIN)
   // The process should crash when going through abnormal termination.
   base::win::SetShouldCrashOnProcessDetach(true);
   base::win::SetAbortBehaviorForCrashReporting();
-  ChromeMainDelegate chrome_main_delegate;
-  int rv = content::ContentMain(instance, sandbox_info, &chrome_main_delegate);
+  params.instance = instance;
+  params.sandbox_info = sandbox_info;
+#else
+  params.argc = argc;
+  params.argv = argv;
+#endif
+
+  int rv = content::ContentMain(&params);
+
+#if defined(OS_WIN)
   base::win::SetShouldCrashOnProcessDetach(false);
+#endif
+
   return rv;
-#elif defined(OS_POSIX)
-int ChromeMain(int argc, const char** argv) {
-  ChromeMainDelegate chrome_main_delegate;
-  return content::ContentMain(argc, argv, &chrome_main_delegate);
-#endif
 }