cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/PRESUBMIT.py

Index: cc/PRESUBMIT.py
diff --git a/cc/PRESUBMIT.py b/cc/PRESUBMIT.py
index 6c08441f405eea1d402681b81e62660a17457b28..f381684bfbc991e110a1087f2e9b750cb255e530 100644
--- a/cc/PRESUBMIT.py
+++ b/cc/PRESUBMIT.py
@@ -146,6 +146,40 @@ def CheckTodos(input_api, output_api):
       items=errors)]
   return []
 
+def CheckScopedPtr(input_api, output_api,
+                   white_list=CC_SOURCE_FILES, black_list=None):
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x,
+                                                            white_list,
+                                                            black_list)
+  errors = []
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    for line_number, line in f.ChangedContents():
+      # Disallow:
+      # return scoped_ptr<T>(foo);
+      # bar = scoped_ptr<T>(foo);
+      # But allow:
+      # return scoped_ptr<T[]>(foo);
+      # bar = scoped_ptr<T[]>(foo);
+      if re.search(r'(=|\breturn)\s*scoped_ptr<.*?(?<!])>\([^)]+\)', line):
+        errors.append(output_api.PresubmitError(
+          ('%s:%d uses explicit scoped_ptr constructor. ' +
+           'Use make_scoped_ptr() instead.') % (f.LocalPath(), line_number)))
+      # Disallow:
+      # return scoped_ptr<T>();
+      # bar = scoped_ptr<T>();
+      if re.search(r'(=|\breturn)\s*scoped_ptr<.*?>\(\)', line):
+        errors.append(output_api.PresubmitError(
+          '%s:%d uses scoped_ptr<T>(). Use nullptr instead.' %
+          (f.LocalPath(), line_number)))
+      # Disallow:
+      # foo.PassAs<T>();
+      if re.search(r'\bPassAs<.*?>\(\)', line):
+        errors.append(output_api.PresubmitError(
+          '%s:%d uses PassAs<T>(). Use Pass() instead.' %
+          (f.LocalPath(), line_number)))
+  return errors
+
 def FindUnquotedQuote(contents, pos):
   match = re.search(r"(?<!\\)(?P<quote>\")", contents[pos:])
   return -1 if not match else match.start("quote") + pos
@@ -286,6 +320,7 @@ def CheckChangeOnUpload(input_api, output_api):
   results += CheckPassByValue(input_api, output_api)
   results += CheckChangeLintsClean(input_api, output_api)
   results += CheckTodos(input_api, output_api)
+  results += CheckScopedPtr(input_api, output_api)
   results += CheckNamespace(input_api, output_api)
   results += CheckForUseOfWrongClock(input_api, output_api)
   results += FindUselessIfdefs(input_api, output_api)