[NotLanded] Implement the fetching algorithm of the Web Manifest.

public/platform/WebManifestError.h

Index: public/platform/WebManifestError.h
diff --git a/Source/bindings/modules/v8/ModuleBindingsInitializer.h b/public/platform/WebManifestError.h
similarity index 50%
copy from Source/bindings/modules/v8/ModuleBindingsInitializer.h
copy to public/platform/WebManifestError.h
index 892bb0ba9eded41f17a2d45d60cd9ca8330227c4..55454e3906f4f0273492ae1cc4f7abd056bf86f0 100644
--- a/Source/bindings/modules/v8/ModuleBindingsInitializer.h
+++ b/public/platform/WebManifestError.h
@@ -2,14 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ModuleBindingsInitializer_h
-#define ModuleBindingsInitializer_h
+#ifndef WebManifestError_h
+#define WebManifestError_h
 
 namespace blink {
 
-class ModuleBindingsInitializer {
-public:
-    static void init();
+enum WebManifestError {
+    NoManifest, // There is no manifest associated with the document.
+    FetchError, // Fetching the manifest resulted in an error.
 };
 
 } // namespace blink