Change DCHECK to DLOG_IF for non zero file watchers in FileBrowserEventRouter.

chrome/browser/chromeos/extensions/file_browser_event_router.cc

Index: chrome/browser/chromeos/extensions/file_browser_event_router.cc
diff --git a/chrome/browser/chromeos/extensions/file_browser_event_router.cc b/chrome/browser/chromeos/extensions/file_browser_event_router.cc
index c861a9cdde7bc1bb718c44e6b7fde2e27efe9a61..4a5cce97c1e8058a635db7045772674ea53978f3 100644
--- a/chrome/browser/chromeos/extensions/file_browser_event_router.cc
+++ b/chrome/browser/chromeos/extensions/file_browser_event_router.cc
@@ -110,7 +110,8 @@ FileBrowserEventRouter::~FileBrowserEventRouter() {
 void FileBrowserEventRouter::Shutdown() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
-  DCHECK(file_watchers_.empty());
+  DLOG_IF(WARNING, !file_watchers_.empty()) << "Not all file watchers are "
+      << "removed. This can happen when Files.app is open during shutdown.";
   STLDeleteValues(&file_watchers_);
   if (!profile_) {
     NOTREACHED();