[DevTools] Make test not flake on MacOS 10.10.

I've been seeing a revert due to this test being flaky.
Root cause appears to be that sometimes, the Window's node
name is just "Window", and sometimes it's "Window / file://".
So I'm thinking this can be cured by making it always Window.

Change-Id: I89e57f248d24462fdcb79e6db4e278e58f93c473
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1546939Reviewed-by: Alexei Filippov <alph@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646454}

third_party/blink/web_tests/inspector-protocol/heap-profiler/heap-snapshot-with-multiple-retainers-expected.txt

@@ -4,10 +4,10 @@ Parsed snapshot
 SUCCESS: found leaking
 path1 = [(Global handles),(GC roots),]
 path2 = [(Global handles),(GC roots),]
-path3 = [V8EventListener,EventListener,InternalNode,InternalNode,HTMLBodyElement,HTMLHtmlElement,HTMLDocument,Window / file://]
+path3 = [V8EventListener,EventListener,InternalNode,InternalNode,HTMLBodyElement,HTMLHtmlElement,HTMLDocument,Window]
 SUCCESS: found a single retaining path for V8EventListener.
 SUCCESS: V8EventListener has an immediate retainer of EventListener.
-path4 = [V8EventListener,EventListener,InternalNode,InternalNode,HTMLDivElement,HTMLBodyElement,HTMLHtmlElement,HTMLDocument,Window / file://]
+path4 = [V8EventListener,EventListener,InternalNode,InternalNode,HTMLDivElement,HTMLBodyElement,HTMLHtmlElement,HTMLDocument,Window]
 SUCCESS: found a single retaining path for V8EventListener.
 SUCCESS: V8EventListener has an immediate retainer of EventListener.
 SUCCESS: found 2 V8EventListeners as retainers.

third_party/blink/web_tests/inspector-protocol/heap-profiler/heap-snapshot-with-multiple-retainers.js

@@ -40,7 +40,19 @@
   }
   // Sort alphabetically to make the test robust.
   function toNames(path) {
-    return path.map(node => node.name().includes('::') ? 'InternalNode' : node.name());
+    let names = [];
+    for (node of path) {
+      if (node.name().includes('::')) {
+        names.push('InternalNode');
+      } else if (node.name() == 'Window / file://') {
+        // In MacOS 10.10 it's sometimes just Window, so we always make it
+        // so to avoid flakiness.
+        names.push('Window');
+      } else {
+        names.push(node.name());
+      }
+    }
+    return names;
   }
   retainerPaths.sort((path1, path2) => {
     let s1 = toNames(path1).join('->');