Fix device_event_log component build, make NonThreadSafe (Take 2)

components/device_event_log/device_event_log.cc

Index: components/device_event_log/device_event_log.cc
diff --git a/components/device_event_log/device_event_log.cc b/components/device_event_log/device_event_log.cc
index 8e720c0f31d2aa56923a319b6e4f73f28d50ab6d..6e70eeb3a2bfd4e8cf77e6fde39f2824efb85651 100644
--- a/components/device_event_log/device_event_log.cc
+++ b/components/device_event_log/device_event_log.cc
@@ -7,6 +7,7 @@
 #include <string>
 
 #include "base/logging.h"
+#include "base/thread_task_runner_handle.h"
 #include "components/device_event_log/device_event_log_impl.h"
 
 namespace device_event_log {
@@ -28,7 +29,12 @@ void Initialize(size_t max_entries) {
   CHECK(!g_device_event_log);
   if (max_entries == 0)
     max_entries = kDefaultMaxEntries;
-  g_device_event_log = new DeviceEventLogImpl(max_entries);
+  g_device_event_log =
+      new DeviceEventLogImpl(base::ThreadTaskRunnerHandle::Get(), max_entries);
+}
+
+bool IsInitialized() {
+  return !!g_device_event_log;
 }
 
 void Shutdown() {