IDL: Put [Exposed=Window] where it's not in Blink's renderer/core/resize_observer

Though Web IDL spec removed [PrimaryGlobal] and made [Exposed] required [1],
many blink's IDL files have not followed it yet. So, this CL adds the keyword
to the IDL files which don't have the keyword yet in the renderer/core/resize_observer
directory.

[1] https://github.com/heycam/webidl/issues/365

Bug: 963267
Change-Id: I5358266254f921ff76999f4200b8617b13e0c1c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1654737
Reviewed-by: Aleks Totic <atotic@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#668628}
diff --git a/third_party/blink/renderer/core/resize_observer/resize_observer.idl b/third_party/blink/renderer/core/resize_observer/resize_observer.idl
index 11ccfc8..8e09fdd 100644
--- a/third_party/blink/renderer/core/resize_observer/resize_observer.idl
+++ b/third_party/blink/renderer/core/resize_observer/resize_observer.idl
@@ -2,13 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://wicg.github.io/ResizeObserver/#resize-observer-callback
+// https://drafts.csswg.org/resize-observer-1/#resize-observer-callback
 
 callback ResizeObserverCallback = void (sequence<ResizeObserverEntry> entries, ResizeObserver observer);
 
-// https://wicg.github.io/ResizeObserver/#resize-observer-interface
+// https://drafts.csswg.org/resize-observer-1/#resize-observer-interface
 
 [
+    Exposed=Window,
     ActiveScriptWrappable,
     Constructor(ResizeObserverCallback callback),
     MeasureAs=ResizeObserver_Constructor,
diff --git a/third_party/blink/renderer/core/resize_observer/resize_observer_entry.idl b/third_party/blink/renderer/core/resize_observer/resize_observer_entry.idl
index 835d47f..969b0f5 100644
--- a/third_party/blink/renderer/core/resize_observer/resize_observer_entry.idl
+++ b/third_party/blink/renderer/core/resize_observer/resize_observer_entry.idl
@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://wicg.github.io/ResizeObserver/#resize-observer-entry-interface
+// https://drafts.csswg.org/resize-observer-1/#resize-observer-entry-interface
 
+[Exposed=Window]
 interface ResizeObserverEntry {
     readonly attribute Element target;
     readonly attribute DOMRectReadOnly contentRect;