Revert of Build Mojo apps in subdirectories, like application packages.

mojo/runner/url_resolver.cc

Index: mojo/runner/url_resolver.cc
diff --git a/mojo/runner/url_resolver.cc b/mojo/runner/url_resolver.cc
index 3ae8bc01a097c769a8c4155471bde762a943243b..0dcf2f772b0cf569af257025e71f8cb9c39dba7d 100644
--- a/mojo/runner/url_resolver.cc
+++ b/mojo/runner/url_resolver.cc
@@ -5,6 +5,8 @@
 #include "mojo/runner/url_resolver.h"
 
 #include "base/base_paths.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/runner/switches.h"
@@ -109,8 +111,20 @@
   // It's still a mojo: URL, use the default mapping scheme.
   std::string query;
   GURL base_url = shell::GetBaseURLAndQuery(mojo_url, &query);
-  const std::string host = base_url.host();
-  return mojo_base_url_.Resolve(host + "/" + host + ".mojo" + query);
+  if (mojo_base_url_.SchemeIsFile()) {
+    const GURL url_with_directory(
+        mojo_base_url_.Resolve(base_url.host() + "/"));
+    const base::FilePath dir(util::UrlToFilePath(url_with_directory));
+    if (base::DirectoryExists(dir)) {
+      const std::string mojo_file_name(base_url.host() + ".mojo");
+      const base::FilePath mojo_path =
+          dir.Append(base::FilePath::FromUTF8Unsafe(mojo_file_name));
+      // Only use the directory if the .mojo exists in the directory.
+      if (base::PathExists(mojo_path))
+        return url_with_directory.Resolve(base_url.host() + ".mojo" + query);
+    }
+  }
+  return mojo_base_url_.Resolve(base_url.host() + ".mojo" + query);
 }
 
 }  // namespace runner