Continuation of CL 5685007, rename the singleton accessor method in more files.

chrome/browser/platform_util_chromeos.cc

Index: chrome/browser/platform_util_chromeos.cc
diff --git a/chrome/browser/platform_util_chromeos.cc b/chrome/browser/platform_util_chromeos.cc
index b8fd8e3a23bb94e9ba25bc898b107ea10bc98080..f0593856a50ec08d76f6d51e8a1487a2f0d4b99e 100644
--- a/chrome/browser/platform_util_chromeos.cc
+++ b/chrome/browser/platform_util_chromeos.cc
@@ -88,7 +88,7 @@ void OpenItem(const FilePath& full_path) {
       ext == ".mp3" ||
       ext == ".mkv" ||
       ext == ".ogg") {
-    MediaPlayer* mediaplayer = MediaPlayer::Get();
+    MediaPlayer* mediaplayer = MediaPlayer::GetInstance();
     std::string url = "file://";
     url += full_path.value();
     GURL gurl(url);