Implement support for importing favorites from Edge on Windows 10.

chrome/utility/importer/ie_importer_win.h

Index: chrome/utility/importer/ie_importer_win.h
diff --git a/chrome/utility/importer/ie_importer_win.h b/chrome/utility/importer/ie_importer_win.h
index 1d3803437d67ad2f983ca86d94ac8714632b09a7..4f01ee7508da7f446e9c20f30af3aca4a782030c 100644
--- a/chrome/utility/importer/ie_importer_win.h
+++ b/chrome/utility/importer/ie_importer_win.h
@@ -76,8 +76,11 @@ class IEImporter : public Importer {
   // Determines which version of IE is in use.
   int CurrentIEVersion() const;
 
+  // Set to true when importing the favorite order in old Edge on Windows 10.

[Ilya Sherman, 2015/11/26 02:04:45]

nit: s/favorite/favorites

[forshaw, 2015/11/30 12:57:59]

Acknowledged.

+  bool edge_import_mode_;

[Ilya Sherman, 2015/11/26 02:04:45]

It's a little semantically weird for the IE importer to support Edge importing. 
Is it actually worthwhile to support importing from old versions of Edge?  How
likely are these to appear in the wild?  (Though since the cost of support is
low, maybe it's worth keeping even for a relatively small benefit.)

[forshaw, 2015/11/30 12:57:59]

Well technically Edge is stripped down IE code so the old favorites model was
based on what was already in IE. Imo it therefore makes sense and also removes
code duplication. It would be nice to not implement it. At least for consumer
versions of Windows 10 that is likely to be using the latest version of Edge but
for Enterprise customers they're on a slower release cycle which means they'll
be using the older version of Edge for some time. 

+
   // IE does not have source path. It's used in unit tests only for providing a
-  // fake source.
+  // fake source and it's used if importing old Edge favorites on Windows 10.
   base::FilePath source_path_;
 
   DISALLOW_COPY_AND_ASSIGN(IEImporter);