[iwyu] Fix cctest inline header inclusion violation.

R=clemensh@chromium.org

Change-Id: I35a69e690a0647e1e6092bf881007198b252d3e8
Reviewed-on: https://chromium-review.googlesource.com/657577Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47921}

test/cctest/cctest.h

@@ -33,9 +33,10 @@
 #include "include/libplatform/libplatform.h"
 #include "include/v8-platform.h"
 #include "src/debug/debug-interface.h"
+#include "src/factory.h"
 #include "src/flags.h"
 #include "src/isolate.h"
-#include "src/objects-inl.h"
+#include "src/objects.h"
 #include "src/utils.h"
 #include "src/v8.h"
 #include "src/zone/accounting-allocator.h"