Remove //third_party/wtl.

Also remove: //build/precompile.* and //build/PRESUBMIT.py (since we no
longer have any *_test.py files in //build).

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/1439833002 .
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index d7195a6..30f1151 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -463,9 +463,9 @@
   # Exclude the following includes from the check:
   # 1) #include <.../...>, e.g., <sys/...> includes often need to appear in a
   # specific order.
-  # 2) <atlbase.h>, "build/build_config.h"
+  # 2) "build/build_config.h"
   excluded_include_pattern = input_api.re.compile(
-      r'\s*#include (\<.*/.*|\<atlbase\.h\>|"build/build_config.h")')
+      r'\s*#include (\<.*/.*|"build/build_config.h")')
   custom_include_pattern = input_api.re.compile(r'\s*#include "(?P<FILE>.*)"')
   # Match the final or penultimate token if it is xxxtest so we can ignore it
   # when considering the special first include.