Define FilePath::NormalizePathSeparators on all platforms

Define FilePath::NormalizePathSeparators on all platforms

I assume the method FilePath::NormalizeWindowsPathSeparators() is intentionally defined only on Windows, but recently I found myself trying to add a static method (named NormalizePathSeparators()) which calls NormalizeWindowsPathSeparators() or does nothing with platform ifdefs, and then found that there's another place defining the same static method.

Maybe we could just add the common method in FilePath then?  It'd at least make the code cleaner at several callsites.  I don't think this has visible negative performance impact with optimization build.

BUG=none
TEST=FilePathTest.NormalizePathSeparators and all other existing tests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=121380

[kinuko, 2012-02-09 16:35:22]

Now that we have several callsites for NormalizeWindowsPathSeparators (all with
ifdefs) I thought it might be worth adding platform-common method for this one--
WDYT?

(Note: I've read the original issue when you decided not to make this method
available on all platforms)

[Mark Mentovai, 2012-02-09 16:43:04]

This should be fine. LGTM.