Reland: Remove DCHECK_IMPLIES/CHECK_IMPLIES.

base/trace_event/memory_dump_manager.cc

Index: base/trace_event/memory_dump_manager.cc
diff --git a/base/trace_event/memory_dump_manager.cc b/base/trace_event/memory_dump_manager.cc
index 800b790ae9099fea45258a955f9776bf5bc4cbcc..9fc95ff5fbc6f3066d09f0e28dea2b1a5c542766 100644
--- a/base/trace_event/memory_dump_manager.cc
+++ b/base/trace_event/memory_dump_manager.cc
@@ -206,9 +206,9 @@ void MemoryDumpManager::UnregisterDumpProvider(MemoryDumpProvider* mdp) {
   // and OnMemoryDump() at the same time).
   // Otherwise, it is not possible to guarantee that its unregistration is
   // race-free. If you hit this DCHECK, your MDP has a bug.
-  DCHECK_IMPLIES(
-      subtle::NoBarrier_Load(&memory_tracing_enabled_),
-      mdp_iter->task_runner && mdp_iter->task_runner->BelongsToCurrentThread())
+  DCHECK(!subtle::NoBarrier_Load(&memory_tracing_enabled_) ||
+         (mdp_iter->task_runner &&
+          mdp_iter->task_runner->BelongsToCurrentThread()))
       << "The MemoryDumpProvider attempted to unregister itself in a racy way. "
       << "Please file a crbug.";