Fix git_nav_downstream.py when origin/master is checked out.

Fix git_nav_downstream.py when origin/master is checked out.

Also fix missing copyright notices.

R=agable@chromium.org
BUG=261738
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=256777

[agable, 2014-03-13 00:48:41]

lgtm

[iannucci, 2014-03-13 02:11:45]

The CQ bit was checked by iannucci@chromium.org

[commit-bot: I haz the power, 2014-03-13 02:11:49]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/iannucci@chromium.org/196433003/20001

[commit-bot: I haz the power, 2014-03-13 02:14:40]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-03-13 02:14:40]

Presubmit check for 196433003-20001 failed and returned exit status 1.

Running presubmit commit checks ...
Checking out rietveld...
Running save-description-on-failure.sh
Running push-basic.sh
Running upstream.sh
Running submit-from-new-dir.sh
Running abandon.sh
Running submodule-merge-test.sh
Running upload-local-tracking-branch.sh
Running hooks.sh
Running post-dcommit-hook-test.sh
Running upload-stale.sh
Running patch.sh
Running basic.sh

** Presubmit ERRORS **
tests/checkout_test.py (86.11s) failed
From /b/git-cache/-tmp-trialsjrfgj-repos-git-repo_1
 * branch            master     -> FETCH_HEAD
From /b/git-cache/-tmp-trialsjrfgj-repos-git-repo_1
   d59ecdc..b06009f  master     -> origin/master
From /b/git-cache/-tmp-trialsjrfgj-repos-git-repo_1
 * branch            master     -> FETCH_HEAD
.EFrom /b/git-cache/-tmp-trialsjrfgj-repos-git-repo_1
 * branch            master     -> FETCH_HEAD
.From /b/git-cache/-tmp-trialsjrfgj-repos-git-repo_1
 * branch            master     -> FETCH_HEAD
....................
======================================================================
ERROR: testException (__main__.GitCheckout)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/checkout_test.py", line 347, in setUp
    self.enabled = self.FAKE_REPOS.set_up_git()
  File
"/b/commit-queue/workdir/tools/depot_tools/testing_support/fake_repos.py", line
359, in set_up_git
    self.set_up()
  File
"/b/commit-queue/workdir/tools/depot_tools/testing_support/fake_repos.py", line
211, in set_up
    self.cleanup_dirt()
  File
"/b/commit-queue/workdir/tools/depot_tools/testing_support/fake_repos.py", line
229, in cleanup_dirt
    if not self.tear_down_git():
  File
"/b/commit-queue/workdir/tools/depot_tools/testing_support/fake_repos.py", line
276, in tear_down_git
    wait_for_port_to_free(self.host, self.git_port)
  File
"/b/commit-queue/workdir/tools/depot_tools/testing_support/fake_repos.py", line
161, in wait_for_port_to_free
    assert False, '%d is still bound' % port
AssertionError: 20000 is still bound

----------------------------------------------------------------------
Ran 23 tests in 85.914s

FAILED (errors=1)


Presubmit checks took 167.5s to calculate.

[iannucci, 2014-03-13 07:46:15]

The CQ bit was checked by iannucci@chromium.org

[commit-bot: I haz the power, 2014-03-13 07:46:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/iannucci@chromium.org/196433003/20001

[commit-bot: I haz the power, 2014-03-13 07:47:51]

Change committed as 256777