Delete the temporary file when generating MHTML with the extension API.

chrome/test/data/extensions/api_test/save_page/test.js

Index: chrome/test/data/extensions/api_test/save_page/test.js
diff --git a/chrome/test/data/extensions/api_test/save_page/test.js b/chrome/test/data/extensions/api_test/save_page/test.js
index 9b69cd9aaf19a579f6e388614f9836c546c4ead0..d199bb2dd0979c534113855db91b1503e3717499 100644
--- a/chrome/test/data/extensions/api_test/save_page/test.js
+++ b/chrome/test/data/extensions/api_test/save_page/test.js
@@ -40,7 +40,9 @@ chrome.test.getConfig(function(config) {
               var text = e.target.result;
               assertTrue(text.indexOf(testUrl) != -1);
               assertTrue(text.indexOf("logo.png") != -1);
-              chrome.test.notifyPass();
+              // Run the GC so the blob is deleted.
+              window.setTimeout(function() { window.gc(); });
+              window.setTimeout(function() { chrome.test.notifyPass(); }, 0);
             };
             reader.readAsText(data);
           });