Change mojo url to always use mojo:foo instead of mojo://foo

mojo/shell/desktop/mojo_main.cc

Index: mojo/shell/desktop/mojo_main.cc
diff --git a/mojo/shell/desktop/mojo_main.cc b/mojo/shell/desktop/mojo_main.cc
index e03aa2a2c51baa2718c09d6ba067880d1ddb7c69..d89b6f3245e594b6c953185d96d4eefb4ac5b03d 100644
--- a/mojo/shell/desktop/mojo_main.cc
+++ b/mojo/shell/desktop/mojo_main.cc
@@ -78,11 +78,11 @@ void Usage() {
       << " <mojo-app> ...\n\n"
       << "A <mojo-app> is a Mojo URL or a Mojo URL and arguments within "
       << "quotes.\n"
-      << "Example: mojo_shell \"mojo://js_standalone test.js\".\n"
+      << "Example: mojo_shell \"mojo:js_standalone test.js\".\n"
       << "<url-lib-path> is searched for shared libraries named by mojo URLs.\n"
       << "The value of <handlers> is a comma separated list like:\n"
-      << "text/html,mojo://html_viewer,"
-      << "application/javascript,mojo://js_content_handler\n";
+      << "text/html,mojo:html_viewer,"
+      << "application/javascript,mojo:js_content_handler\n";
 }
 
 bool ConfigureURLMappings(const std::string& mappings,