move openMediaGalleryManager fn out of experimental.

chrome/renderer/resources/extensions/media_galleries_custom_bindings.js

Index: chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/experimental.media_galleries_custom_bindings.js b/chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
similarity index 66%
copy from chrome/renderer/resources/extensions/experimental.media_galleries_custom_bindings.js
copy to chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
index 0ffff12c93269af9853f8fee065babec5bfcb503..00965487fe91e15f61b18fa7ee69c47c5be67879 100644
--- a/chrome/renderer/resources/extensions/experimental.media_galleries_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
@@ -4,11 +4,11 @@
 
 // Custom bindings for the Media Gallery API.
 
-var mediaGalleriesNatives = requireNative('experimental_mediaGalleries');
+var mediaGalleriesNatives = requireNative('mediaGalleries');
 
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
-chromeHidden.registerCustomHook('experimental.mediaGalleries',
+chromeHidden.registerCustomHook('mediaGalleries',
                                 function(bindingsAPI, extensionId) {
   var apiFunctions = bindingsAPI.apiFunctions;
 
@@ -28,12 +28,4 @@ chromeHidden.registerCustomHook('experimental.mediaGalleries',
       request.callback(result);
     request.callback = null;
   });
-
-  // extractEmbeddedThumbnails uses a renderer side handler so that it can
-  // synchronously return a result.  The result object's state is computable
-  // from the function's input.
-  apiFunctions.setHandleRequest('extractEmbeddedThumbnails',
-                                function(fileEntry) {
-    return mediaGalleriesNatives.ExtractEmbeddedThumbnails(fileEntry);
-  });
 });