fix error reporting:

...
  File "chromium/scripts/generate_gyp.py", line 757, in GetIncludedSources
    exit('Failed to find file', include_file_path)
TypeError: __call__() takes at most 2 arguments (3 given)

--- ./third_party/ffmpeg/chromium/scripts/generate_gyp.py~	2015-07-27 07:15:51.000000000 +0300
+++ ./third_party/ffmpeg/chromium/scripts/generate_gyp.py	2015-07-27 07:15:55.928135410 +0300
@@ -79,6 +79,7 @@
 import string
 import subprocess
 import shutil
+import sys
 
 COPYRIGHT = """# Copyright %d The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -149,6 +150,9 @@
 # Mac doesn't have any platform specific files, so just use linux and win.
 SUPPORTED_PLATFORMS = ['linux', 'win']
 
+def die(error):
+    print >> sys.stderr, error
+    sys.exit(1)
 
 def NormalizeFilename(name):
   """ Removes leading path separators in an attempt to normalize paths."""
@@ -753,7 +757,7 @@
     elif include_file_path in IGNORED_INCLUDE_FILES:
       continue
     else:
-      exit('Failed to find file', include_file_path)
+      die('Failed to find file: ' + include_file_path)
 
     # At this point we've found the file. Check if its in our ignore list which
     # means that the list should be updated to no longer mention this file.
@@ -772,7 +776,7 @@
   licensecheck_path = os.path.abspath(os.path.join(
       source_root, 'third_party', 'devscripts', 'licensecheck.pl'));
   if not os.path.exists(licensecheck_path):
-    exit('Could not find licensecheck.pl: ' + str(licensecheck_path))
+    die('Could not find licensecheck.pl: ' + str(licensecheck_path))
 
   check_process = subprocess.Popen([licensecheck_path,
                                     '-l', '100',
@@ -838,7 +842,7 @@
 
       # Sanity check: source set should not have any renames prior to this step.
       if RENAME_PREFIX in basename:
-        exit('Found unexpected renamed file in SourceSet: %s' % basename)
+        die('Found unexpected renamed file in SourceSet: %s' % basename)
 
       # Craft a new unique basename from the path of the colliding file
       if basename in known_basenames:
@@ -896,7 +900,7 @@
   sets = CreatePairwiseDisjointSets(sets)
 
   if not sets:
-    exit('ERROR: failed to find any source sets. ' +
+    die('ERROR: failed to find any source sets. ' +
          'Are build_dir (%s) and/or source_dir (%s) options correct?' %
               (options.build_dir, options.source_dir))
 
@@ -904,7 +908,7 @@
 
   if not CheckLicensesForStaticLinking(sets, source_dir,
                                        options.print_licenses):
-    exit ('GENERATE FAILED: invalid licenses detected.')
+    die('GENERATE FAILED: invalid licenses detected.')
   print 'License checks passed.'
 
   # Open for writing.