Add related_applications field to manifest parser.

content/browser/manifest/manifest_manager_host.cc

Index: content/browser/manifest/manifest_manager_host.cc
diff --git a/content/browser/manifest/manifest_manager_host.cc b/content/browser/manifest/manifest_manager_host.cc
index d32a8c349cba212852e94b04903216ad95696d2a..e60cb0a4219766b0a38016aefbbe7f2a9f32b133 100644
--- a/content/browser/manifest/manifest_manager_host.cc
+++ b/content/browser/manifest/manifest_manager_host.cc
@@ -127,6 +127,13 @@ void ManifestManagerHost::OnRequestManifestResponse(
         manifest.gcm_sender_id.string().substr(
             0, Manifest::kMaxIPCStringLength),
         manifest.gcm_sender_id.is_null());
+  for (size_t i = 0; i < manifest.chrome_related_applications.size(); ++i) {

[mlamouri (slow - plz ping), 2015/02/17 12:43:20]

nit: maybe that would be easier to read:
  for (ChromeRelatedApplication& application :
manifest.chrome_related_applications) {
    ...
  }

+    manifest.chrome_related_applications[i].id= base::NullableString16(
+        manifest.chrome_related_applications[i].id.string().substr(
+            0,
+            Manifest::kMaxIPCStringLength),
+        manifest.chrome_related_applications[i].id.is_null());
+  }
 
   callback->Run(manifest);
   callbacks->Remove(request_id);