bump protocol

Author: devtools-bot

_data/tot/protocol.json

@@ -7489,6 +7489,12 @@
                             "optional": true,
                             "description": "Base URL that <code>Document</code> or <code>FrameOwner</code> node uses for URL completion."
                         },
+                        {
+                            "name": "contentLanguage",
+                            "type": "string",
+                            "optional": true,
+                            "description": "Only set for documents, contains the document's content language."
+                        },
                         {
                             "name": "publicId",
                             "type": "string",

_versions/tot.html

@@ -8,7 +8,7 @@ <h2 class="heading">latest (tip-of-tree)</h2>
 
 <h5 browser>Latest <a
    href="https://chromium.googlesource.com/chromium/src/+log/master/third_party/WebKit/Source/core/inspector/browser_protocol.json">browser_protocol.json</a> version updated:</h5>
-<code browser>Date:   Fri Jun 30 08:15:16 2017 -0700
+<code browser>Date:   Fri Jun 30 13:15:20 2017 -0700
 </code>
 
 <h5 js>Latest <a