Disable DownloadExtensionTest.DownloadExtensionTest_FileIcon_Active on Windows.

"DownloadExtensionTest.DownloadExtensionTest_FileIcon_Active" is flaky.

BUG=678967
TBR=benjhayden@chromium.org

Review-Url: https://codereview.chromium.org/2616133002
Cr-Commit-Position: refs/heads/master@{#442027}

chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc

@@ -948,10 +948,16 @@ scoped_refptr<UIThreadExtensionFunction> MockedGetFileIconFunction(
   return function;
 }
 
+// https://crbug.com/678967
+#if defined(OS_WIN)
+#define MAYBE_DownloadExtensionTest_FileIcon_Active DISABLED_DownloadExtensionTest_FileIcon_Active
+#else
+#define MAYBE_DownloadExtensionTest_FileIcon_Active DownloadExtensionTest_FileIcon_Active
+#endif
 // Test downloads.getFileIcon() on in-progress, finished, cancelled and deleted
 // download items.
 IN_PROC_BROWSER_TEST_F(DownloadExtensionTest,
-    DownloadExtensionTest_FileIcon_Active) {
+    MAYBE_DownloadExtensionTest_FileIcon_Active) {
   DownloadItem* download_item = CreateSlowTestDownload();
   ASSERT_TRUE(download_item);
   ASSERT_FALSE(download_item->GetTargetFilePath().empty());