DevTools: simplify http handler delegate as it is moving into content.

chrome/test/data/devtools/target_list/background.js

Index: chrome/test/data/devtools/target_list/background.js
diff --git a/chrome/test/data/devtools/target_list/background.js b/chrome/test/data/devtools/target_list/background.js
index 400e18cef268980b93d3b7abd0883534ac037df9..d034e1ed370785548a88986fbd245df089ec1679 100644
--- a/chrome/test/data/devtools/target_list/background.js
+++ b/chrome/test/data/devtools/target_list/background.js
@@ -35,9 +35,6 @@ function checkTarget(targets, url, type, opt_title, opt_faviconUrl) {
   // a freshly created tab. Ignore the check then.
   if (target.faviconUrl && opt_faviconUrl)
     chrome.test.assertEq(opt_faviconUrl, target.faviconUrl);
-  // Sometimes thumbnailUrl is not available for a freshly loaded tab.
-  if (target.thumbnailUrl)
-    chrome.test.assertEq('/thumb/' + target.id, target.thumbnailUrl);
   chrome.test.assertEq(opt_title || target.url, target.title);
   chrome.test.assertEq(type, target.type);
   chrome.test.assertEq('ws://' + wsAddress, target.webSocketDebuggerUrl);