Fix merge_from_chromium.py script to work with new buildspec repo

New repo at
https://chrome-internal.googlesource.com/chrome/tools/buildspec

The updated script will work with 37.0.2062.70 in the 37.0.2062 branch.

Change-Id: I298f66e15bbf98ea9d83fc7e4b67efb9b19e0d4c
diff --git a/chromium/tools/merge_from_chromium.py b/chromium/tools/merge_from_chromium.py
index 752b6ad..6a7a67c 100755
--- a/chromium/tools/merge_from_chromium.py
+++ b/chromium/tools/merge_from_chromium.py
@@ -157,8 +157,10 @@
   if root_sha1:
     deps_content = _ReadGitFile(root_sha1, '.DEPS.git')
   else:
-    deps_content = _ReadGitFile('FETCH_HEAD', version + '/DEPS',
-                                buildspec_url, 'master')
+    deps_content = _ReadGitFile('FETCH_HEAD',
+                                'releases/' + version + '/.DEPS.git',
+                                buildspec_url,
+                                'master')
 
   deps_vars = _ParseDEPS(deps_content)