Fix IDL dependency computation for partial interfaces

Source/build/scripts/list_idl_files_with_partial_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 11 matching lines @@
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """This file returns a list of all the IDL files that contain a partial interface."""
 
 import re
-import sys
 
-partial_interface_regex = re.compile(r'partial\s+interface\s+(\w+).+\]', re.M | re.S)
+PARTIAL_INTERFACE_RE = re.compile(r'partial\s+interface\s+(\w+)\s[^{]*\{',
+                                  re.MULTILINE)
+
+
+def contains_partial_interface(filename):
+    with open(filename) as f:
+        return bool(re.search(PARTIAL_INTERFACE_RE, f.read()))
 
 
 def DoMain(filenames):
-    partial_files = set()
-    for filename in filenames:
-        with open(filename) as f:
-            match = re.search(partial_interface_regex, f.read())
-            if match:
-                partial_files.add(filename)
-    return '\n'.join(partial_files)
+    partial_interface_filenames = [filename for filename in filenames
+                                   if contains_partial_interface(filename)]
+    return '\n'.join(partial_interface_filenames)