Delete chrome.mediaGalleriesPrivate because the functionality unique to it has since been migrated and/or rewritten to standard chrome.mediaGalleries. Specifically, the file watch APIs have all been migrated and are in stable as of M39: https://developer.chrome.com/apps/mediaGalleries#method-addGalleryWatch

BUG=144491,166950
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/847623002

Cr-Commit-Position: refs/heads/master@{#312660}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index df3975393..682f6dbc 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -453,8 +453,8 @@
   FILEMANAGERPRIVATE_GETSIZESTATS,
   DOWNLOADS_RESUME,
   COOKIES_GETALLCOOKIESTORES,
-  MEDIAGALLERIESPRIVATE_ADDGALLERYWATCH,
-  MEDIAGALLERIESPRIVATE_REMOVEGALLERYWATCH,
+  DELETED_MEDIAGALLERIESPRIVATE_ADDGALLERYWATCH,
+  DELETED_MEDIAGALLERIESPRIVATE_REMOVEGALLERYWATCH,
   DELETED_WEBVIEW_EXECUTESCRIPT,
   NOTIFICATIONS_UPDATE,
   NOTIFICATIONS_CLEAR,
@@ -469,8 +469,8 @@
   NETWORKINGPRIVATE_GETVISIBLENETWORKS,
   NETWORKINGPRIVATE_STARTCONNECT,
   NETWORKINGPRIVATE_STARTDISCONNECT,
-  MEDIAGALLERIESPRIVATE_GETALLGALLERYWATCH,
-  MEDIAGALLERIESPRIVATE_REMOVEALLGALLERYWATCH,
+  DELETED_MEDIAGALLERIESPRIVATE_GETALLGALLERYWATCH,
+  DELETED_MEDIAGALLERIESPRIVATE_REMOVEALLGALLERYWATCH,
   FILEMANAGERPRIVATE_SEARCHDRIVEMETADATA,
   DELETED_ECHOPRIVATE_CHECKALLOWREDEEMOFFERS,
   DELETED_MEDIAGALLERIESPRIVATE_EJECTDEVICE,