Fix bug in tracing path for memlog.

Bug: 
Change-Id: Idd4d452d03c8c5c20628c35d788fb322ba99df39
Reviewed-on: https://chromium-review.googlesource.com/661945Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501495}

chrome/browser/profiling_host/profiling_process_host.cc

@@ -202,7 +202,7 @@ bool ProfilingProcessHost::OnMemoryDump(
   // Attempt to dump all processes. Some of these processes will not be profiled
   // [e.g. utility processes, including the profiling process]. The profiling
   // process will gracefully handle these failures.
-  DCHECK_EQ(GetCurrentMode(), Mode::kAll);
+  DCHECK_NE(GetCurrentMode(), Mode::kNone);
   base::ProcessIterator process_iter(NULL);
   while (const base::ProcessEntry* process_entry =
              process_iter.NextProcessEntry()) {