Remove about:srcdoc url conversion.

chrome/test/data/extensions/api_test/executescript/frame_id/test.js

Index: chrome/test/data/extensions/api_test/executescript/frame_id/test.js
diff --git a/chrome/test/data/extensions/api_test/executescript/frame_id/test.js b/chrome/test/data/extensions/api_test/executescript/frame_id/test.js
index cfd38c71bbfab4ae8d8b8e24e27cd8800440bef8..6fa3f36ce8f0abde9a9b3527e90384f0bd02293b 100644
--- a/chrome/test/data/extensions/api_test/executescript/frame_id/test.js
+++ b/chrome/test/data/extensions/api_test/executescript/frame_id/test.js
@@ -147,12 +147,10 @@ function runTests(config) {
     },
 
     function executeScriptInSrcdocFrameWithoutMatchAboutBlank() {
-      // TODO(robwu): Why is the origin serialized as "about:blank" instead of
-      // "about:srcdoc"?
       chrome.tabs.executeScript(
           tabId, {frameId: ID_FRAME_SRCDOC, code: 'document.URL'},
           fail(
-              'Cannot access "about:blank" at origin "' + testOrigin + '". ' +
+              'Cannot access "about:srcdoc" at origin "' + testOrigin + '". ' +
               'Extension must have permission to access the frame\'s origin, ' +
               'and matchAboutBlank must be true.'));
     },
@@ -283,12 +281,10 @@ function runTests(config) {
     },
 
     function insertCSSInSrcdocFrameWithoutMatchAboutBlank() {
-      // TODO(robwu): Why is the origin serialized as "about:blank" instead of
-      // "about:srcdoc"?
       chrome.tabs.insertCSS(
           tabId, {frameId: ID_FRAME_SRCDOC, code: 'body{color:red;}'},
           fail(
-              'Cannot access "about:blank" at origin "' + testOrigin + '". ' +
+              'Cannot access "about:srcdoc" at origin "' + testOrigin + '". ' +
               'Extension must have permission to access the frame\'s origin, ' +
               'and matchAboutBlank must be true.'));
     },