Switch jsoncpp to be single DEPS entry

This change should be a no-op as it keeps the DEPS'd revision
the same.  Rather than DEPSing it two sub-repos it simply
includes the since top level repo.

Once this change is in we can switch to using a github mirror
rather than an SVN mirror. Once that its done we can look
at rollin the DEPSs forward.

Also, include a temporary exclusion in checklicenses.py
to cover some .py files in the jsoncpp source that do
not contain a license.

BUG=472809

Review URL: https://codereview.chromium.org/1054753002

Cr-Commit-Position: refs/heads/master@{#324061}

DEPS

@@ -239,11 +239,8 @@ deps = {
   'src/third_party/openmax_dl':
     Var('chromium_git') + '/external/webrtc/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),
 
-  'src/third_party/jsoncpp/source/include':
-    Var('chromium_git') + '/external/jsoncpp/jsoncpp/include.git' + '@' + 'b0dd48e02b6e6248328db78a65b5c601f150c349',
-
-  'src/third_party/jsoncpp/source/src/lib_json':
-    Var('chromium_git') + '/external/jsoncpp/jsoncpp/src/lib_json.git' + '@' + 'a8caa51ba2f80971a45880425bf2ae864a786784',
+  'src/third_party/jsoncpp/source':
+    Var('chromium_git') + '/external/jsoncpp/jsoncpp.git' + '@' + 'ab1e40f3bce061ea6f9bdc60351d6cde2a4f872b', # from svn 248
 
   'src/third_party/libyuv':
     Var('chromium_git') + '/external/libyuv.git' + '@' + 'd204db647e591ccf0e2589236ecea90330d65a66', # from svn revision 1171

tools/checklicenses/checklicenses.py

@@ -210,6 +210,10 @@ PATH_SPECIFIC_WHITELISTED_LICENSES = {
     'third_party/icu': [  # http://crbug.com/98301
         'UNKNOWN',
     ],
+    'third_party/jsoncpp/source': [
+        # https://github.com/open-source-parsers/jsoncpp/issues/234
+        'UNKNOWN',
+    ],
     'third_party/lcov': [  # http://crbug.com/98304
         'UNKNOWN',
     ],