Revert of Ensure the new navigation classifier works in the real world....

Revert of Ensure the new navigation classifier works in the real world. (patchset #1 id:1 of https://codereview.chromium.org/1136663004/)

Reason for revert:
Occasional crashes.

Original issue's description:
> Ensure the new navigation classifier works in the real world.
>
> BUG=369661
> TEST=No whammies!
>
> Committed: https://crrev.com/f97970c11c08a18e9ecea0b1b4c77122371a0e4f
> Cr-Commit-Position: refs/heads/master@{#329497}

TBR=creis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=369661

Review URL: https://codereview.chromium.org/1140123002

Cr-Commit-Position: refs/heads/master@{#329849}

content/browser/frame_host/navigation_controller_impl.cc

@@ -821,6 +821,7 @@ bool NavigationControllerImpl::RendererDidNavigate(
 
   // Do navigation-type specific actions. These will make and commit an entry.
   details->type = ClassifyNavigation(rfh, params);
+#if DCHECK_IS_ON()
   // For site-per-process, both ClassifyNavigation methods get it wrong (see
   // http://crbug.com/464014) so don't worry about a mismatch if that's the
   // case.
@@ -832,9 +833,10 @@ bool NavigationControllerImpl::RendererDidNavigate(
     // TODO(avi): Work this out.
     if (details->type != NAVIGATION_TYPE_SAME_PAGE &&
         new_type != NAVIGATION_TYPE_SAME_PAGE) {
-      CHECK_EQ(details->type, new_type);
+      DCHECK_EQ(details->type, new_type);
     }
   }
+#endif  // DCHECK_IS_ON()
 
   // is_in_page must be computed before the entry gets committed.
   details->is_in_page = AreURLsInPageNavigation(rfh->GetLastCommittedURL(),