DevTools: migrate sidebar pane's titleElement to use Toolbar.

LayoutTests/inspector/extensions/extensions-audits-expected.txt

Index: LayoutTests/inspector/extensions/extensions-audits-expected.txt
diff --git a/LayoutTests/inspector/extensions/extensions-audits-expected.txt b/LayoutTests/inspector/extensions/extensions-audits-expected.txt
index d613bd2b4509f0d4d3989796a9ef17a9441cf3bd..27bf1a1fdfad19d62f03aa2af917f6a144270a6d 100644
--- a/LayoutTests/inspector/extensions/extensions-audits-expected.txt
+++ b/LayoutTests/inspector/extensions/extensions-audits-expected.txt
@@ -6,46 +6,46 @@ RUNNING TEST: extension_testAudits
 Progress: 50%
 Progress: 75%
  Extension audits
-      [severity severe] Failed rule (42)
-       this rule always fails
-      [severity warning] Rule with details subtree (1)
-       This rule has a lot of details
-        Subtree
-         Some url: 
-          WebKit
-          more text 
-          http://www.google.com
-         ... and a snippet
-           function rand()
+     [severity severe] Failed rule (42)
+      this rule always fails
+     [severity warning] Rule with details subtree (1)
+      This rule has a lot of details
+       Subtree
+        Some url: 
+         WebKit
+         more text 
+         http://www.google.com
+        ... and a snippet
+          function rand()
 {
     return 4;
 }
-           /path/to/error.html:10
-               object details
-                 a
-                 : 
-                 42
-                 b
-                 : 
-                 "foo"
-                 __proto__
-                 : 
-                 Object
-                  <
-                   span
-                   
-                    id
-                   ="
-                    test-element
-                   "
-                  >
-                  …
-                  <
-                   /span
-                  >
-           extensions-audits.html:20
-      [severity info] Passed rule
-       this rule always passes ok
+          /path/to/error.html:10
+              object details
+                a
+                : 
+                42
+                b
+                : 
+                "foo"
+                __proto__
+                : 
+                Object
+                 <
+                  span
+                  
+                   id
+                  ="
+                   test-element
+                  "
+                 >
+                 …
+                 <
+                  /span
+                 >
+          extensions-audits.html:20
+     [severity info] Passed rule
+      this rule always passes ok
  Extension audits that fail
 category.onAuditStarted fired
 failedCategory.onAuditStarted fired, throwing exception