Rename convert_404_to_None -> return_none_on_404.

third_party/WebKit/Tools/Scripts/webkitpy/common/net/web_mock.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/net/web_mock.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/net/web_mock.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/net/web_mock.py
index ac323a84508d1262bda21ca448ee6e8a79b0bb5a..6e75ab2fde60a884aa0c17cf5feece9dbd923dee 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/net/web_mock.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/net/web_mock.py
@@ -35,11 +35,11 @@ class MockWeb(object):
         self.urls = urls or {}
         self.urls_fetched = []
 
-    def get_binary(self, url, convert_404_to_None=False):
+    def get_binary(self, url, return_none_on_404=False):
         self.urls_fetched.append(url)
         if url in self.urls:
             return self.urls[url]
-        return "MOCK Web result, convert 404 to None=%s" % convert_404_to_None
+        return "MOCK Web result, convert 404 to None=%s" % return_none_on_404
 
 
 # FIXME: Classes which are using Browser probably want to use Web instead.