Remove a useless NOTREACHED in nacl_listener.cc

This is a split of https://codereview.chromium.org/315323002/ after patchset #3.

There's more optimization done on a PGO build than on a regular one, this results in some "Unreachable code" warnings that we don't see normally. Currently this warning is disabled for the PGO builds because it triggers on some places like this one.

BUG=380175

Review URL: https://codereview.chromium.org/321273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@281828 0039d316-1c4b-4281-b951-d872f2087c98

components/nacl/loader/nacl_listener.cc

@@ -391,7 +391,6 @@ void NaClListener::OnStart(const nacl::NaClStartParams& params) {
 #endif
 
   NaClChromeMainStartApp(nap, args);
-  NOTREACHED();
 }
 
 void NaClListener::StartNonSfi(const nacl::NaClStartParams& params) {