Lazily load extension API schemas

chrome/common/extensions/features/manifest_feature.cc

Index: chrome/common/extensions/features/manifest_feature.cc
diff --git a/chrome/common/extensions/features/manifest_feature.cc b/chrome/common/extensions/features/manifest_feature.cc
index 28406d8fecacb2f006413a9d2315e6ea3c61ad7f..51d9fd51d5c39746fa52d00b74f5f0b0b3d6a1e5 100644
--- a/chrome/common/extensions/features/manifest_feature.cc
+++ b/chrome/common/extensions/features/manifest_feature.cc
@@ -17,16 +17,18 @@ ManifestFeature::~ManifestFeature() {
 Feature::Availability ManifestFeature::IsAvailableToContext(
     const Extension* extension,
     Feature::Context context,
+    const GURL& url,
     Feature::Platform platform) const {
   Availability availability = SimpleFeature::IsAvailableToContext(extension,
                                                                   context,
+                                                                  url,
                                                                   platform);
   if (!availability.is_available())
     return availability;
 
   // We know we can skip manifest()->GetKey() here because we just did the same
   // validation it would do above.
-  if (!extension->manifest()->value()->HasKey(name()))
+  if (extension && !extension->manifest()->value()->HasKey(name()))
     return CreateAvailability(NOT_PRESENT, extension->GetType());
 
   return CreateAvailability(IS_AVAILABLE);