Replace instances of shadowRoot with root.

tracing/tracing/ui/analysis/single_thread_time_slice_sub_view_test.html

Index: tracing/tracing/ui/analysis/single_thread_time_slice_sub_view_test.html
diff --git a/tracing/tracing/ui/analysis/single_thread_time_slice_sub_view_test.html b/tracing/tracing/ui/analysis/single_thread_time_slice_sub_view_test.html
index 91245e9617efcc381f532c8e4ebcb33dbd0d0357..64c19a95bd025fa880be1b851d5b7f61e276327f 100644
--- a/tracing/tracing/ui/analysis/single_thread_time_slice_sub_view_test.html
+++ b/tracing/tracing/ui/analysis/single_thread_time_slice_sub_view_test.html
@@ -57,7 +57,7 @@ tr.b.unittest.testSuite(function() {
       assert.equal(e.selection[0], binderSlice);
       didSelectionChangeHappen = true;
     });
-    view.shadowRoot.querySelector('tr-ui-a-analysis-link').click();
+    view.root.querySelector('tr-ui-a-analysis-link').click();
     assert.isTrue(didSelectionChangeHappen);
   });
 
@@ -87,7 +87,7 @@ tr.b.unittest.testSuite(function() {
       assert.equal(e.selection[0], launcherSlice);
       didSelectionChangeHappen = true;
     });
-    view.shadowRoot.querySelector('tr-ui-a-analysis-link').click();
+    view.root.querySelector('tr-ui-a-analysis-link').click();
     assert.isTrue(didSelectionChangeHappen);
   });
 });