Fix check for when symbols are out of date.

build/linux/dump_app_syms.py

Index: build/linux/dump_app_syms.py
diff --git a/build/linux/dump_app_syms.py b/build/linux/dump_app_syms.py
index 65f76450c17622bebe45c97a9b9162664ce992d0..12e693ef18418c69f40d15f94c924078da50b42c 100644
--- a/build/linux/dump_app_syms.py
+++ b/build/linux/dump_app_syms.py
@@ -21,7 +21,7 @@ outfile = sys.argv[4]
 
 # Dump only when the output file is out-of-date.
 if not os.path.isfile(outfile) or \
-   os.stat(outfile).st_mtime > os.stat(infile).st_mtime:
+   os.stat(outfile).st_mtime < os.stat(infile).st_mtime:
   with open(outfile, 'w') as outfileobj:
     subprocess.check_call([dumpsyms, infile], stdout=outfileobj)