Removed investigation CHECK from didCommitNavigation.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index 7222d3dfc1cb51ceeef36b4df87f125ea28076dd..9b525b191c81c5bcb699d1d5d2fb23d3ae3e976a 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -4861,16 +4861,6 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
 
 - (void)webView:(WKWebView*)webView
     didCommitNavigation:(WKNavigation*)navigation {
-  // This method will crash if |currentSessionEntry| is null. If this check is
-  // hit it means that |didStartProvisionalNavigation| was called as expected
-  // but it did not call |registerLoadRequest|. TODO(crbug.com/676721): remove
-  // this CHECK once there is at least one crash on this line (which means that
-  // |didStartProvisionalNavigation| did not call |registerLoadRequest| and it
-  // should be fixed.
-  CHECK([self currentSessionEntry] || !navigation ||
-        [_navigationStates stateForNavigation:navigation] ==
-            web::WKNavigationState::STARTED);
-
   [_navigationStates setState:web::WKNavigationState::COMMITTED
                 forNavigation:navigation];