Move more file_util functions to base namespace.

content/browser/renderer_host/media/video_capture_host_unittest.cc

Index: content/browser/renderer_host/media/video_capture_host_unittest.cc
diff --git a/content/browser/renderer_host/media/video_capture_host_unittest.cc b/content/browser/renderer_host/media/video_capture_host_unittest.cc
index a4e79e851aded207824aaf106a28e72ce3da5316..1c169a4cd5d1bd66f1c6715c1221727cb78a4efa 100644
--- a/content/browser/renderer_host/media/video_capture_host_unittest.cc
+++ b/content/browser/renderer_host/media/video_capture_host_unittest.cc
@@ -60,7 +60,7 @@ class DumpVideo {
   void StartDump(int width, int height) {
     base::FilePath file_name = base::FilePath(base::StringPrintf(
         FILE_PATH_LITERAL("dump_w%d_h%d.yuv"), width, height));
-    file_.reset(file_util::OpenFile(file_name, "wb"));
+    file_.reset(base::OpenFile(file_name, "wb"));
     expected_size_ = media::VideoFrame::AllocationSize(
         media::VideoFrame::I420, gfx::Size(width, height));
   }