Update fetch to support more flexible refspecs

recipes/blink.py

Index: recipes/blink.py
diff --git a/recipes/blink.py b/recipes/blink.py
index 2e3aa9ace9bb53c4f61a70dfc5405d53a7505fb4..b453f5d6be4ac96159fcf57748b359c1735f2d80 100644
--- a/recipes/blink.py
+++ b/recipes/blink.py
@@ -17,9 +17,7 @@ class Blink(recipe_util.Recipe):
   def fetch_spec(props):
     submodule_spec = {
       'third_party/WebKit': {
-        'svn_url': 'svn://svn.chromium.org/blink/trunk',

[Michael Achenbach, 2014/10/22 09:46:28]

So, auto-svn has a mapping from git to svn urls?

[agable, 2014/10/22 10:03:33]

auto-svn determines the mapping directly from the git-svn-id footer. That's why
it's "auto": no need for any configuration stored anywhere.

-        'svn_branch': 'trunk',
-        'svn_ref': 'master',
+        'auto': True,
       }
     }
     return {