Remove builtin/runtime name clash presubmit check.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 1bcd9922c56aeddd3199456e1143a291d97cd1b7..c9a8a99de4c3e1cca190b563f69e6c5918304c8a 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -67,7 +67,6 @@ def _V8PresubmitChecks(input_api, output_api):
         input_api.PresubmitLocalPath(), 'tools'))
   from presubmit import CppLintProcessor
   from presubmit import SourceProcessor
-  from presubmit import CheckRuntimeVsNativesNameClashes
   from presubmit import CheckExternalReferenceRegistration
   from presubmit import CheckAuthorizedAuthor
 
@@ -78,9 +77,6 @@ def _V8PresubmitChecks(input_api, output_api):
     results.append(output_api.PresubmitError(
         "Copyright header, trailing whitespaces and two empty lines " \
         "between declarations check failed"))
-  if not CheckRuntimeVsNativesNameClashes(input_api.PresubmitLocalPath()):
-    results.append(output_api.PresubmitError(
-        "Runtime/natives name clash check failed"))
   if not CheckExternalReferenceRegistration(input_api.PresubmitLocalPath()):
     results.append(output_api.PresubmitError(
         "External references registration check failed"))