Builders failed on: 
- WebKit Mac10.11 (dbg): 
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.11%20%28dbg%29


Diff between expected and actual two-elements-one-line.html:

--- /b/rr/tmpjcG2P9/w/layout-test-results/fast/spatial-navigation/snav-two-elements-one-line-expected.txt
+++ /b/rr/tmpjcG2P9/w/layout-test-results/fast/spatial-navigation/snav-two-elements-one-line-actual.txt
@@ -5,10 +5,10 @@
 PASS successfullyParsed is true
 
 TEST COMPLETE
-PASS gFocusedDocument.activeElement.getAttribute("id") is "e1"
-PASS gFocusedDocument.activeElement.getAttribute("id") is "e2"
-PASS gFocusedDocument.activeElement.getAttribute("id") is "e3"
-PASS gFocusedDocument.activeElement.getAttribute("id") is "e2"
-PASS gFocusedDocument.activeElement.getAttribute("id") is "e1"
+FAIL gFocusedDocument.activeElement.getAttribute("id") should be e1. Was start.
+FAIL gFocusedDocument.activeElement.getAttribute("id") should be e2. Was e1.
+FAIL gFocusedDocument.activeElement.getAttribute("id") should be e3. Was e2.
+FAIL gFocusedDocument.activeElement.getAttribute("id") should be e2. Was e1.
+FAIL gFocusedDocument.activeElement.getAttribute("id") should be e1. Was start.
 PASS gFocusedDocument.activeElement.getAttribute("id") is "start"
 This test is testing that we can handle 2 inline elements in the same line.


Most likely causing the failure (CC'ed):

58cb30d4 (varkha): MacViews: Allows the toolkit-views Manage Passwords Dialog to be used
74934b2b (jzfeng): use devtools command to do window management


Full regression range:

2d9f45d2 (rlanday): Rewrite loops in DocumentMarkerController to use ListForType()
5e87893e (vasilii): Notify PasswordAutofillAgent about dynamic forms after the document was parsed.
39a09b97 (yoichio): Remove LayoutView from LayoutSelection::commit()
019c92b5 (robhogan): Treat cells with percent height as auto if their container depends on content height
7fd3f671 (ollel): Add curly brackets to list of characters that gn needs to escape
58cb30d4 (varkha): MacViews: Allows the toolkit-views Manage Passwords Dialog to be used
74934b2b (jzfeng): use devtools command to do window management
3a05731e (gambard): LabelObserver is no longer retained by the label
7d42d2d5 (vasilii): Enable PasswordManagerBrowserTestBase.PreferPasswordFormManagerWhichFinishedMatching.