Move core web_view code to extensions.

extensions/browser/api/extensions_api_client.h

Index: extensions/browser/api/extensions_api_client.h
diff --git a/extensions/browser/api/extensions_api_client.h b/extensions/browser/api/extensions_api_client.h
index 93fae579b7c6b75d206283715654266a3627d0e6..a8e6aa7c42990ee86d8f8c3eeb60c047db2118f6 100644
--- a/extensions/browser/api/extensions_api_client.h
+++ b/extensions/browser/api/extensions_api_client.h
@@ -26,6 +26,10 @@ class HidService;
 namespace extensions {
 
 class AppViewGuestDelegate;
+class WebViewGuest;
+class WebViewGuestDelegate;
+class WebViewPermissionHelper;
+class WebViewPermissionHelperDelegate;
 class SettingsObserver;
 class SettingsStorageFactory;
 class ValueStoreCache;
@@ -75,6 +79,17 @@ class ExtensionsAPIClient {
   // Returns the HidService instance for this embedder.
   virtual device::HidService* GetHidService();
 
+  // Returns a delegate for some of WebViewGuest's behavior. The caller owns the
+  // return WebViewGuestDelegate.
+  virtual WebViewGuestDelegate* CreateWebViewGuestDelegate(
+      WebViewGuest* web_view_guest);
+
+  // Returns a delegate for some of WebViewPermissionHelper's behavior. The
+  // caller owns the returned WebViewPermissionHelperDelegate.
+  virtual WebViewPermissionHelperDelegate*
+      CreateWebViewPermissionHelperDelegate(
+          WebViewPermissionHelper* web_view_permission_helper);
+
   virtual void RegisterGuestViewTypes() {}
 
   // NOTE: If this interface gains too many methods (perhaps more than 20) it