Fix licensing information for breakpad/

Fix licensing information for breakpad/
    
This change adds the required fields to README.chromium and adds a license
file.
    
The license file contains the license for both breakpad and libcurl (included
by breakpad as a third-party directory) ...
- breakpad - Taken from upstream COPYING at r255. See
  http://code.google.com/p/google-breakpad/source/browse/trunk/COPYING?r=255.
  Note that this file isn't pulled into Chromium via DEPS as we don't pull the
  entire breakpad repository.
- libcurl - Taken from upstream src/third_party/curl/COPYING at r932. See
  http://code.google.com/p/google-breakpad/source/browse/trunk/src/third_party/curl/COPYING?r=932.
  Note that this file isn't currently in Chromium as we're synced to r922 via
  DEPS.
    
breakpad/ is currently skipped by tools/licenses.py. This exception can't
easily be removed because breakpad/ contains a subdirectory named third_party
which causes the tool to barf.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=126088

[Mark Mentovai, 2012-03-09 19:12:22]

LGTM

[commit-bot: I haz the power, 2012-03-11 22:07:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/9630015/2001

[commit-bot: I haz the power, 2012-03-12 00:27:03]

Change committed as 126088