Roll chromium_revision c089d37..159828f (353662:353696) + fix GN

DEPS

 # This file contains dependencies for WebRTC that are not shared with Chromium.
 # If you wish to add a dependency that is present in Chromium's src/DEPS or a
 # directory from the Chromium checkout, you should add it to setup_links.py
 # instead.
 
 vars = {
   'extra_gyp_flag': '-Dextra_gyp_flag=0',
   'chromium_git': 'https://chromium.googlesource.com',
-  'chromium_revision': 'c089d37d656ebb4bb19570c769cd184b1e7e4e73',
+  'chromium_revision': '159828fc541faca44767e090cdc44545545f6155',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than
 # https; the latter can cause problems for users behind proxies.
 deps = {
   # When rolling gflags, also update
   # https://chromium.googlesource.com/chromium/deps/webrtc/webrtc.DEPS
   'src/third_party/gflags/src':
     Var('chromium_git') + '/external/gflags/src@e7390f9185c75f8d902c05ed7d20bb94eb914d0c', # from svn revision 82
 
@@ skipping 72 matching lines @@
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     'name': 'gyp',
     'pattern': '.',
     'action': ['python', 'src/webrtc/build/gyp_webrtc',
                Var('extra_gyp_flag')],
   },
 ]