favor DCHECK_CURRENTLY_ON for better logs in chrome/browser/media_galleries , metrics and nacl_host

chrome/browser/media_galleries/fileapi/native_media_file_util.cc

Index: chrome/browser/media_galleries/fileapi/native_media_file_util.cc
diff --git a/chrome/browser/media_galleries/fileapi/native_media_file_util.cc b/chrome/browser/media_galleries/fileapi/native_media_file_util.cc
index 9584beded6c49a74a85c39c913811b02a28ffd9c..79dc4f0d205dca4afa5628b3c9b587a23cfe2207 100644
--- a/chrome/browser/media_galleries/fileapi/native_media_file_util.cc
+++ b/chrome/browser/media_galleries/fileapi/native_media_file_util.cc
@@ -54,7 +54,7 @@ void DidOpenSnapshot(
     const storage::AsyncFileUtil::CreateOrOpenCallback& callback,
     const scoped_refptr<storage::ShareableFileReference>& file_ref,
     base::File file) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   if (!file.IsValid()) {
     callback.Run(file.Pass(), base::Closure());
     return;
@@ -104,7 +104,7 @@ void NativeMediaFileUtil::CreatedSnapshotFileForCreateOrOpen(
     const base::File::Info& file_info,
     const base::FilePath& platform_path,
     const scoped_refptr<storage::ShareableFileReference>& file_ref) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   if (result != base::File::FILE_OK) {
     callback.Run(base::File(), base::Closure());
     return;