Define iTunes location for media galleries tests.

chrome/browser/media_galleries/fileapi/itunes_finder_mac.h

Index: chrome/browser/media_galleries/fileapi/itunes_finder_mac.h
diff --git a/chrome/browser/media_galleries/fileapi/itunes_finder_mac.h b/chrome/browser/media_galleries/fileapi/itunes_finder_mac.h
index d123b1251dc0774576856a8d0996fbbffbec1630..b78b4b56f2a5884f90d066c6a031e0f4492eaeeb 100644
--- a/chrome/browser/media_galleries/fileapi/itunes_finder_mac.h
+++ b/chrome/browser/media_galleries/fileapi/itunes_finder_mac.h
@@ -7,6 +7,8 @@
 
 #include "chrome/browser/media_galleries/fileapi/itunes_finder.h"
 
+class MacPreferences;
+
 namespace itunes {
 
 class ITunesFinderMac : public ITunesFinder {
@@ -14,6 +16,8 @@ class ITunesFinderMac : public ITunesFinder {
   explicit ITunesFinderMac(const ITunesFinderCallback& callback);
   virtual ~ITunesFinderMac();
 
+  static void SetMacPreferencesForTesting(MacPreferences* preferences);

[Lei Zhang, 2013/08/13 20:02:34]

make |preferences| a scoped_ptr, so it's obvious it's taking ownership?

+
  private:
   virtual void FindITunesLibraryOnFileThread() OVERRIDE;