DevTools: shard inspector/elements tests for faster execution.

LayoutTests/inspector/elements/create-shadow-root-expected.txt

Index: LayoutTests/inspector/elements/create-shadow-root-expected.txt
diff --git a/LayoutTests/inspector/elements/create-shadow-root-expected.txt b/LayoutTests/inspector/elements/create-shadow-root-expected.txt
deleted file mode 100644
index c76f1fede08e472d82aabf6a74b8c29c450fe53f..0000000000000000000000000000000000000000
--- a/LayoutTests/inspector/elements/create-shadow-root-expected.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-CONSOLE WARNING: Calling Element.createShadowRoot() for an element which already hosts a shadow root is deprecated. See https://www.chromestatus.com/features/4668884095336448 for more details.
-Tests that elements panel updates dom tree structure upon shadow root creation.
-
-
-Running: testDumpInitial
-========= Original ========
-- <div id="container">
-      <div id="child"></div>
-  </div>
-
-Running: testCreateShadowRoot
-===== After createShadowRoot =====
-- <div id="container">
-    - #shadow-root
-          <div id="shadow-1"></div>
-      <div id="child"></div>
-  </div>
-
-Running: testCreateSecondShadowRoot
-===== After second createShadowRoot =====
-- <div id="container">
-    - #shadow-root
-          <div id="shadow-2"></div>
-    - #shadow-root
-          <div id="shadow-1"></div>
-      <div id="child"></div>
-  </div>
-