MediaSettingsRange: s/long/double/ in MediaSettingsRange.idl and PhotoCapabilities.idl

third_party/WebKit/Source/modules/imagecapture/MediaSettingsRange.idl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://w3c.github.io/mediacapture-image/index.html#mediasettingsrange
 
 [
     RuntimeEnabled=ImageCapture,
 ] interface MediaSettingsRange {
-    readonly attribute long max;
-    readonly attribute long min;
-    readonly attribute long current;
-    readonly attribute long step;
+    readonly attribute double max;
+    readonly attribute double min;
+    readonly attribute double current;
+    readonly attribute double step;
 };