Hoist command line parsing into ChildProcessMain
https://bugs.webkit.org/show_bug.cgi?id=108010

Reviewed by Dan Bernstein.

* NetworkProcess/EntryPoint/mac/LegacyProcess/NetworkProcessMain.mm:
(NetworkProcessMain):
* PluginProcess/EntryPoint/mac/LegacyProcess/PluginProcessMain.mm:
(PluginProcessMain):
* Shared/EntryPointUtilities/mac/LegacyProcess/ChildProcessMain.h:
(WebKit::ChildProcessMain):
* SharedWorkerProcess/EntryPoint/mac/LegacyProcess/SharedWorkerProcessMain.mm:
(SharedWorkerProcessMain):
* WebProcess/EntryPoint/mac/LegacyProcess/WebContentProcessMain.mm:
(WebContentProcessMain):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140915 268f45cc-cd09-0410-ab3c-d52691b4dbfc