Make sure pages that are closing but not yet closed are still suspended.

third_party/WebKit/Source/core/page/ScopedPageSuspender.h

Index: third_party/WebKit/Source/core/page/ScopedPageSuspender.h
diff --git a/third_party/WebKit/Source/core/page/ScopedPageSuspender.h b/third_party/WebKit/Source/core/page/ScopedPageSuspender.h
index 5b30bff86920949f442d2e6726a4d554dac2d97a..2889f8a0453b3f68f112347679bced1b218d49c0 100644
--- a/third_party/WebKit/Source/core/page/ScopedPageSuspender.h
+++ b/third_party/WebKit/Source/core/page/ScopedPageSuspender.h
@@ -26,6 +26,8 @@
 
 namespace blink {
 
+class Page;
+
 class CORE_EXPORT ScopedPageSuspender final {
   WTF_MAKE_NONCOPYABLE(ScopedPageSuspender);
   USING_FAST_MALLOC(ScopedPageSuspender);
@@ -34,6 +36,10 @@ class CORE_EXPORT ScopedPageSuspender final {
   explicit ScopedPageSuspender();
   ~ScopedPageSuspender();
 
+ private:
+  friend class Page;
+
+  static void setSuspended(bool);
   static bool isActive();
 };