heap: Change DCHECK in FromInnerAddress to CHECK

This change is needed to check canary for existing bugs caused by
incorrect algorithm of page header extraction for large pages.

To sherrifs: this causes regressions. The commit will be reverted in
a few days.

Change-Id: I0df59aa055b8783c834cfdf29717d388294fe9bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827364Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700273}

third_party/blink/renderer/platform/heap/heap_page.h

@@ -1069,7 +1069,7 @@ PLATFORM_EXPORT ALWAYS_INLINE BasePage* PageFromObject(const void* object) {
   BasePage* page = reinterpret_cast<BasePage*>(BlinkPageAddress(address) +
                                                kBlinkGuardPageSize);
   // Page must have a valid magic.
-  DCHECK(page->IsValid());
+  CHECK(page->IsValid());
 #if DCHECK_IS_ON()
   DCHECK(page->Contains(address));
 #endif