Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

content/test/web_contents_observer_sanity_checker.cc

Index: content/test/web_contents_observer_sanity_checker.cc
diff --git a/content/test/web_contents_observer_sanity_checker.cc b/content/test/web_contents_observer_sanity_checker.cc
index 1935d2ecd5b1b175dd09b912c385879663dd6fa5..2754ddeba4970367e297c5eb737e79a608faeff4 100644
--- a/content/test/web_contents_observer_sanity_checker.cc
+++ b/content/test/web_contents_observer_sanity_checker.cc
@@ -157,16 +157,16 @@
     NavigationHandle* navigation_handle) {
   CHECK(NavigationIsOngoing(navigation_handle));
 
-  CHECK(!(navigation_handle->HasCommitted() &&
-          !navigation_handle->IsErrorPage()) ||
-        navigation_handle->GetNetErrorCode() == net::OK);
-  CHECK(!(navigation_handle->HasCommitted() &&
-          navigation_handle->IsErrorPage()) ||
-        navigation_handle->GetNetErrorCode() != net::OK);
+  CHECK_IMPLIES(
+      navigation_handle->HasCommitted() && !navigation_handle->IsErrorPage(),
+      navigation_handle->GetNetErrorCode() == net::OK);
+  CHECK_IMPLIES(
+      navigation_handle->HasCommitted() && navigation_handle->IsErrorPage(),
+      navigation_handle->GetNetErrorCode() != net::OK);
   CHECK_EQ(navigation_handle->GetWebContents(), web_contents());
 
-  CHECK(!navigation_handle->HasCommitted() ||
-        navigation_handle->GetRenderFrameHost() != nullptr);
+  CHECK_IMPLIES(navigation_handle->HasCommitted(),
+                navigation_handle->GetRenderFrameHost() != nullptr);
 
   ongoing_navigations_.erase(navigation_handle);
 }