Switch WebUITestHandler to use ExecuteJavascriptInWebFrameCallbackResult.

chrome/browser/ui/webui/web_ui_browsertest.cc

Index: chrome/browser/ui/webui/web_ui_browsertest.cc
diff --git a/chrome/browser/ui/webui/web_ui_browsertest.cc b/chrome/browser/ui/webui/web_ui_browsertest.cc
index 9ae134fa44e323ad8c6da57dc2beda7e92d1b0fc..d384fd24b4a2ecfc8c8cd4b214f882cd20029f5c 100644
--- a/chrome/browser/ui/webui/web_ui_browsertest.cc
+++ b/chrome/browser/ui/webui/web_ui_browsertest.cc
@@ -517,7 +517,7 @@ IN_PROC_BROWSER_TEST_F(WebUIBrowserExpectFailTest, TestFailsFast) {
   AddLibrary(FilePath(FILE_PATH_LITERAL("sample_downloads.js")));
   ui_test_utils::NavigateToURL(browser(), GURL(chrome::kChromeUIDownloadsURL));
   EXPECT_FATAL_FAILURE(RunJavascriptTestNoReturn("DISABLED_BogusFunctionName"),
-                       "WebUITestHandler::Observe");
+                       "WebUITestHandler::JavaScriptComplete");
 }
 
 // Test that bogus javascript fails fast - no timeout waiting for result.
@@ -525,7 +525,7 @@ IN_PROC_BROWSER_TEST_F(WebUIBrowserExpectFailTest, TestRuntimeErrorFailsFast) {
   AddLibrary(FilePath(FILE_PATH_LITERAL("runtime_error.js")));
   ui_test_utils::NavigateToURL(browser(), GURL(kDummyURL));
   EXPECT_FATAL_FAILURE(RunJavascriptTestNoReturn("TestRuntimeErrorFailsFast"),
-                       "WebUITestHandler::Observe");
+                       "WebUITestHandler::JavaScriptComplete");
 }
 
 // Test that bogus javascript fails async test fast as well - no timeout waiting
@@ -535,7 +535,7 @@ IN_PROC_BROWSER_TEST_F(WebUIBrowserExpectFailTest, TestFailsAsyncFast) {
   ui_test_utils::NavigateToURL(browser(), GURL(chrome::kChromeUIDownloadsURL));
   EXPECT_FATAL_FAILURE(
       RunJavascriptAsyncTestNoReturn("DISABLED_BogusFunctionName"),
-      "WebUITestHandler::Observe");
+      "WebUITestHandler::JavaScriptComplete");
 }
 
 // Tests that the async framework works.