Refactor guest view availability to be API not permission based.

chrome/browser/guest_view/guest_view_base.cc

Index: chrome/browser/guest_view/guest_view_base.cc
diff --git a/chrome/browser/guest_view/guest_view_base.cc b/chrome/browser/guest_view/guest_view_base.cc
index 5e4ebab8e8250d3ab47342e678db1eac084268b5..4681228c6bc1f1bf2ee7d0be9877c8eff1837823 100644
--- a/chrome/browser/guest_view/guest_view_base.cc
+++ b/chrome/browser/guest_view/guest_view_base.cc
@@ -18,6 +18,8 @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/common/features/feature.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 using content::WebContents;
@@ -96,16 +98,30 @@ GuestViewBase::GuestViewBase(content::BrowserContext* browser_context,
       weak_ptr_factory_(this) {
 }
 
-void GuestViewBase::Init(
-    const std::string& embedder_extension_id,
-    int embedder_render_process_id,
-    const base::DictionaryValue& create_params,
-    const WebContentsCreatedCallback& callback) {
+void GuestViewBase::Init(const std::string& embedder_extension_id,
+                         int embedder_render_process_id,
+                         content::WebContents* web_contents,
+                         const base::DictionaryValue& create_params,
+                         const WebContentsCreatedCallback& callback) {
   if (initialized_)
     return;
   initialized_ = true;
 
-  if (!CanEmbedderUseGuestView(embedder_extension_id)) {
+  extensions::Feature* feature = GetFeature();
+  CHECK(feature);
+
+  const extensions::Extension* embedder_extension =
+      extensions::ExtensionRegistry::Get(browser_context_)
+          ->enabled_extensions()
+          .GetByID(embedder_extension_id);
+
+  extensions::Feature::Availability availability =
+      feature->IsAvailableToContext(
+          embedder_extension,
+          // TODO: determine the correct context type from the process ID.

[not at google - send to devlin, 2014/07/31 22:07:45]

There is a CL I need to write before being able to implement this, but it'll be
quite simple.

+          extensions::Feature::BLESSED_EXTENSION_CONTEXT,
+          web_contents->GetLastCommittedURL());
+  if (!availability.is_available()) {
     callback.Run(NULL);
     return;
   }