Fix filtering of where edits are applied when --all switch is used.

tools/clang/scripts/run_tool.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Wrapper script to help run clang tools across Chromium code.
 
 How to use this tool:
 If you want to run the tool across all Chromium code:
 run_tool.py <tool> <path/to/compiledb>
 
@@ skipping 301 matching lines @@
   os.environ['PATH'] = '%s%s%s' % (
       os.path.abspath(os.path.join(
           os.path.dirname(__file__),
           '../../../third_party/llvm-build/Release+Asserts/bin')),
       os.pathsep,
       os.environ['PATH'])
 
   if args.generate_compdb:
     compile_db.GenerateWithNinja(args.compile_database)
 
+  filenames = set(_GetFilesFromGit(args.path_filter))
   if args.all:
-    filenames = set(_GetFilesFromCompileDB(args.compile_database))
-    source_filenames = filenames
+    source_filenames = set(_GetFilesFromCompileDB(args.compile_database))
   else:
-    filenames = set(_GetFilesFromGit(args.path_filter))
     # Filter out files that aren't C/C++/Obj-C/Obj-C++.
     extensions = frozenset(('.c', '.cc', '.cpp', '.m', '.mm'))
     source_filenames = [f
                         for f in filenames
                         if os.path.splitext(f)[1] in extensions]
   dispatcher = _CompilerDispatcher(args.tool, args.tool_args,
                                    args.compile_database,
                                    source_filenames)
   dispatcher.Run()
   # Filter out edits to files that aren't in the git repository, since it's not
   # useful to modify files that aren't under source control--typically, these
   # are generated files or files in a git submodule that's not part of Chromium.
   _ApplyEdits({k: v
                for k, v in dispatcher.edits.iteritems()
                if os.path.realpath(k) in filenames})
   return -dispatcher.failed_count
 
 
 if __name__ == '__main__':
-  sys.exit(main())
+  sys.exit(main())