ui: Add another presubmit check to catch two more scoped_ptr usages.

This should catch the following usages:

1- return scoped_ptr<T>(foo)
2- bar = scoped_ptr<T>(foo)

And recommend the solo usage of make_scoped_ptr().

The entries were found with the following command line:

$ git grep -E '(=|\breturn)\s*scoped_ptr<.*?>([^)]+)'

BUG=None
TEST=g cl presubmit -uv
R=sky@chromium.org,maruel@chromium.org

Review URL: https://codereview.chromium.org/919253002

Cr-Commit-Position: refs/heads/master@{#317669}

ui/PRESUBMIT.py

@@ -12,6 +12,7 @@ INCLUDE_CPP_FILES_ONLY = (
   r'.*\.(cc|h|mm)$',
 )
 
+
 def CheckScopedPtr(input_api, output_api,
                    white_list=INCLUDE_CPP_FILES_ONLY, black_list=None):
   black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
@@ -22,11 +23,22 @@ def CheckScopedPtr(input_api, output_api,
   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 input_api.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:
       # scoped_ptr<T>()
-      if input_api.re.search(r'\bscoped_ptr<.*?>\(\)', line):
+      if re.search(r'\bscoped_ptr<.*?>\(\)', line):
         errors.append(output_api.PresubmitError(
-          '%s:%d uses scoped_ptr<T>(). Use nullptr instead.' %
-          (f.LocalPath(), line_number)))
+            '%s:%d uses scoped_ptr<T>(). Use nullptr instead.' %
+            (f.LocalPath(), line_number)))
   return errors