Enable demangling in asan_symbolize.py.

BUG=none
R=glider@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/287063010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271692 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/asan/asan_symbolize.py

@@ -42,6 +42,7 @@ def disable_buffering():
 
 def main():
   disable_buffering()
+  asan_symbolize.demangle = True
   loop = asan_symbolize.SymbolizationLoop(binary_name_filter=fix_filename)
   loop.process_stdin()