Convert Media Galleries to use base::File

Unfortunately, this brings in changes to webkit/browser/fileapi, and once
that changes, a lot of files have to be updated.

The bright side is that most of the collateral changes are just trivial
renaming of PlatformFileError -> File::Error and PlatformFileInfo ->
File::Info

BUG=322664

Review URL: https://codereview.chromium.org/145303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247301 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/public/test/test_file_system_backend.h b/content/public/test/test_file_system_backend.h
index 4b49747f..9ce56fb 100644
--- a/content/public/test/test_file_system_backend.h
+++ b/content/public/test/test_file_system_backend.h
@@ -46,11 +46,11 @@
   virtual fileapi::CopyOrMoveFileValidatorFactory*
       GetCopyOrMoveFileValidatorFactory(
       fileapi::FileSystemType type,
-      base::PlatformFileError* error_code) OVERRIDE;
+      base::File::Error* error_code) OVERRIDE;
   virtual fileapi::FileSystemOperation* CreateFileSystemOperation(
       const fileapi::FileSystemURL& url,
       fileapi::FileSystemContext* context,
-      base::PlatformFileError* error_code) const OVERRIDE;
+      base::File::Error* error_code) const OVERRIDE;
   virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
       const fileapi::FileSystemURL& url,
       int64 offset,