Simplify mojo_shell since it's now only used for Mandoline.

mojo/application/application_runner_chromium.cc

Index: mojo/application/application_runner_chromium.cc
diff --git a/mojo/application/application_runner_chromium.cc b/mojo/application/application_runner_chromium.cc
index 069ff90e346b73affdf6a940c690ce63cb747a9e..e5f21caa20b9a19c5e604fdbca48496555e95b5a 100644
--- a/mojo/application/application_runner_chromium.cc
+++ b/mojo/application/application_runner_chromium.cc
@@ -13,6 +13,18 @@
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 
+int g_argc;
+const char* const* g_argv;
+#if !defined(OS_WIN)
+extern "C" {
+__attribute__((visibility("default"))) void InitCommandLineArgs(
+    int argc, const char* const* argv) {
+  g_argc = argc;
+  g_argv = argv;
+}
+}
+#endif
+
 namespace mojo {
 
 // static
@@ -29,6 +41,10 @@ ApplicationRunnerChromium::ApplicationRunnerChromium(
 
 ApplicationRunnerChromium::~ApplicationRunnerChromium() {}
 
+void ApplicationRunnerChromium::InitBaseCommandLine() {
+  base::CommandLine::Init(g_argc, g_argv);
+}
+
 void ApplicationRunnerChromium::set_message_loop_type(
     base::MessageLoop::Type type) {
   DCHECK_NE(base::MessageLoop::TYPE_CUSTOM, type);
@@ -42,7 +58,7 @@ MojoResult ApplicationRunnerChromium::Run(
   DCHECK(!has_run_);
   has_run_ = true;
 
-  base::CommandLine::Init(0, NULL);
+  InitBaseCommandLine();
   base::AtExitManager at_exit;
 
 #ifndef NDEBUG