Refactor some more BrowserMain code. Move core code that's required by all embedders to content.

content/common/content_switches.cc

Index: content/common/content_switches.cc
===================================================================
--- content/common/content_switches.cc	(revision 100153)
+++ content/common/content_switches.cc	(working copy)
@@ -503,6 +503,12 @@
 const char kScrollPixels[]                  = "scroll-pixels";
 #endif
 
+#if defined(OS_MACOSX) || defined(OS_WIN)
+// Use the system SSL library (Secure Transport on Mac, SChannel on Windows)
+// instead of NSS for SSL.
+const char kUseSystemSSL[]                  = "use-system-ssl";
+#endif
+
 #if !defined(OFFICIAL_BUILD)
 // Causes the renderer process to throw an assertion on launch.
 const char kRendererCheckFalseTest[]        = "renderer-check-false-test";