Implement ManifestParser in content/.

content/public/common/manifest.cc

Index: content/public/common/manifest.cc
diff --git a/content/child/sync_load_response.cc b/content/public/common/manifest.cc
similarity index 55%
copy from content/child/sync_load_response.cc
copy to content/public/common/manifest.cc
index 163153aa23766cc3a0b71a8fa8e1730efdb7a464..cd30aa36f4f7c272092edfddc3f5f1a9cd4504aa 100644
--- a/content/child/sync_load_response.cc
+++ b/content/public/common/manifest.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/child/sync_load_response.h"
+#include "content/public/common/manifest.h"
 
 namespace content {
 
-SyncLoadResponse::SyncLoadResponse() {}
+bool Manifest::IsEmpty() const {
+  return name.is_null() && short_name.is_null();
+}
 
-SyncLoadResponse::~SyncLoadResponse() {}
-
-}  // namespace content
+} // namespace content