Disable flaky DomSerializerBrowserTests on all platforms

content/renderer/dom_serializer_browsertest.cc

Index: content/renderer/dom_serializer_browsertest.cc
diff --git a/content/renderer/dom_serializer_browsertest.cc b/content/renderer/dom_serializer_browsertest.cc
index a16ee72095cbe9d7f362ed9da1b4cc94b43b16fa..3c3e549c12b6a4857c2b51ffe01707e306a00ac3 100644
--- a/content/renderer/dom_serializer_browsertest.cc
+++ b/content/renderer/dom_serializer_browsertest.cc
@@ -640,15 +640,11 @@ class DomSerializerTests : public ContentBrowserTest,
 
 // If original contents have document type, the serialized contents also have
 // document type.
-// Disabled by ellyjones@ on 2015-05-18, see https://crbug.com/488495.
-#if defined(OS_MACOSX)
-#define MAYBE_SerializeHTMLDOMWithDocType DISABLED_SerializeHTMLDOMWithDocType
-#else
-#define MAYBE_SerializeHTMLDOMWithDocType SerializeHTMLDOMWithDocType
-#endif
+// Disabled on OSX by ellyjones@ on 2015-05-18, see https://crbug.com/488495,
+// on all platforms by tsergeant@ on 2016-03-10, see https://crbug.com/593575
 
 IN_PROC_BROWSER_TEST_F(DomSerializerTests,
-                       MAYBE_SerializeHTMLDOMWithDocType) {
+                       DISABLED_SerializeHTMLDOMWithDocType) {
   base::FilePath page_file_path =
       GetTestFilePath("dom_serializer", "youtube_1.htm");
   GURL file_url = net::FilePathToFileURL(page_file_path);
@@ -725,16 +721,11 @@ IN_PROC_BROWSER_TEST_F(DomSerializerTests, SerializeHTMLDOMWithAddingMOTW) {
 // declaration as first child of HEAD element for resolving WebKit bug:
 // http://bugs.webkit.org/show_bug.cgi?id=16621 even the original document
 // does not have META charset declaration.
-// Disabled by battre@ on 2015-05-21, see https://crbug.com/488495.
-#if defined(OS_MACOSX)
-#define MAYBE_SerializeHTMLDOMWithNoMetaCharsetInOriginalDoc \
-  DISABLED_SerializeHTMLDOMWithNoMetaCharsetInOriginalDoc
-#else
-#define MAYBE_SerializeHTMLDOMWithNoMetaCharsetInOriginalDoc \
-  SerializeHTMLDOMWithNoMetaCharsetInOriginalDoc
-#endif
-IN_PROC_BROWSER_TEST_F(DomSerializerTests,
-                       MAYBE_SerializeHTMLDOMWithNoMetaCharsetInOriginalDoc) {
+// Disabled on OSX by battre@ on 2015-05-21, see https://crbug.com/488495,
+// on all platforms by tsergeant@ on 2016-03-10, see https://crbug.com/593575
+IN_PROC_BROWSER_TEST_F(
+    DomSerializerTests,
+    DISABLED_SerializeHTMLDOMWithNoMetaCharsetInOriginalDoc) {
   base::FilePath page_file_path =
       GetTestFilePath("dom_serializer", "youtube_1.htm");
   // Get file URL.