Fix the git-svn remote for the depot_tools and nacl recipes.

The depot_tools and nacl recipes aren't setting up git-svn
properly. There is no git-svn branch in the git mirror for
depot-tools and nacl, just master.
As a consequence "fetch depot-tools" ends up recreating all
the objects from svn taking much more time than it should.

BUG=

Review URL: https://codereview.chromium.org/183743010

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@254506 0039d316-1c4b-4281-b951-d872f2087c98

recipes/depot_tools.py

@@ -26,7 +26,7 @@ class DepotTools(recipe_util.Recipe):
       'solutions': [solution],
       'svn_url': 'svn://svn.chromium.org/chrome',
       'svn_branch': 'trunk/tools/depot_tools',
-      'svn_ref': 'git-svn',
+      'svn_ref': 'master',
     }
     if props.get('submodule_git_svn_spec'):
       spec['submodule_git_svn_spec'] = props['submodule_git_svn_spec']

recipes/nacl.py

@@ -27,7 +27,7 @@ class NaCl(recipe_util.Recipe):
       'solutions': [solution],
       'svn_url': 'svn://svn.chromium.org/native_client',
       'svn_branch': 'trunk/src/native_client',
-      'svn_ref': 'git-svn',
+      'svn_ref': 'master',
     }
     if props.get('submodule_git_svn_spec'):
       spec['submodule_git_svn_spec'] = props['submodule_git_svn_spec']

recipes/naclports.py

@@ -26,7 +26,7 @@ class Naclports(recipe_util.Recipe):
       'solutions': [solution],
       'svn_url': 'https://naclports.googlecode.com/svn',
       'svn_branch': 'trunk/src',
-      'svn_ref': 'git-svn',
+      'svn_ref': 'master',
     }
     if props.get('submodule_git_svn_spec'):
       spec['submodule_git_svn_spec'] = props['submodule_git_svn_spec']