Revert "Remove <(webrtc_root) from source file entries."

And the follow-up fix in r8198 that was not sufficient.
Reason: breaks Chromium bots runhooks (GYP).

I will have to try some more to make sure I don't
include test code, since include_tests==0 in Chromium.

TBR=andrew@webrtc.org, tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/37039004

Cr-Commit-Position: refs/heads/master@{#8200}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8200 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 320b07a..c8386f6 100755
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -127,7 +127,7 @@
   # Disallow referencing source files with paths above the GYP file location.
   source_pattern = input_api.re.compile(r'sources.*?\[(.*?)\]',
                                         re.MULTILINE | re.DOTALL)
-  file_pattern = input_api.re.compile(r"'((\.\./.*?)|(<\(webrtc_root\).*?))'")
+  file_pattern = input_api.re.compile(r"'(\.\./.*?)'")
   violating_gyp_files = set()
   violating_source_entries = []
   for gyp_file in gyp_files: