Move runner stuff into a runner namespace.

mojo/runner/desktop/main.cc

Index: mojo/runner/desktop/main.cc
diff --git a/mojo/runner/desktop/main.cc b/mojo/runner/desktop/main.cc
index b5d8576d4e30c861af91a28975316b021601568a..1764c3f110008845807b793be043b98fdb7c5e87 100644
--- a/mojo/runner/desktop/main.cc
+++ b/mojo/runner/desktop/main.cc
@@ -13,12 +13,12 @@ int main(int argc, char** argv) {
   base::AtExitManager at_exit;
   base::CommandLine::Init(argc, argv);
 
-  mojo::shell::InitializeLogging();
+  mojo::runner::InitializeLogging();
 
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kChildProcess))
-    return mojo::shell::ChildProcessMain();
+    return mojo::runner::ChildProcessMain();
 
-  return mojo::shell::LauncherProcessMain(argc, argv);
+  return mojo::runner::LauncherProcessMain(argc, argv);
 }