Reenable timeline tests

https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2517500
has been submitted.

R=aerotwist@chromium.org

Bug: 1011811
Change-Id: I247d3dcba9e1bab20c031237ae2b7950bea230e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519453
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Paul Lewis <aerotwist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824065}

third_party/blink/web_tests/TestExpectations

@@ -6240,10 +6240,6 @@ crbug.com/1144273 http/tests/devtools/sources/debugger-ui/continue-to-location-m
 crbug.com/1145424 [ Linux ] http/tests/devtools/sources/debugger-ui/reveal-execution-line.js [ Pass Timeout ]
 crbug.com/1145424 [ Win ] http/tests/devtools/sources/debugger-ui/reveal-execution-line.js [ Pass Timeout ]
 
-# DevTools roll
-crbug.com/1011811 http/tests/devtools/tracing/timeline-misc/timeline-user-timings.js [ Skip ]
-crbug.com/1011811 http/tests/devtools/tracing/timeline-misc/timeline-aggregated-details.js [ Skip ]
-
 # Disabled until CL with fix gets merged https://chromium-review.googlesource.com/c/chromium/src/+/2504259
 crbug.com/1127115 inspector-protocol/runtime/runtime-console-log-node-letter-case.js [ Failure ]
 crbug.com/1127115 inspector-protocol/runtime/runtime-console-log-node-document-type.js [ Failure ]

third_party/blink/web_tests/http/tests/devtools/tracing/timeline-misc/timeline-aggregated-details.js

@@ -588,7 +588,7 @@
     } else {
       TestRunner.addResult(type);
     }
-    var rootNode = tree._dataGrid.rootNode();
+    var rootNode = tree.dataGrid.rootNode();
     for (var node of rootNode.children)
       printEventTree(1, node._profileNode, node._treeView);
   }

third_party/blink/web_tests/http/tests/devtools/tracing/timeline-misc/timeline-user-timings.js

@@ -72,7 +72,7 @@
     TestRunner.addResult('');
     TestRunner.addResult(type);
     const tree = getTreeView(type);
-    const rootNode = tree._dataGrid.rootNode();
+    const rootNode = tree.dataGrid.rootNode();
     for (const node of rootNode.children)
       printEventTree(1, node._profileNode, node._treeView);
   }