Disable InstantExtendedTest.SearchDoesntReuseInstantTab on Linux.

chrome/browser/ui/search/instant_extended_interactive_uitest.cc

Index: chrome/browser/ui/search/instant_extended_interactive_uitest.cc
diff --git a/chrome/browser/ui/search/instant_extended_interactive_uitest.cc b/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
index 6ae46d3549a23000bbda4e6a32f9c7004d605010..481e367b20957b8859dc6f4a47dfe06f5378370f 100644
--- a/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
+++ b/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
@@ -307,8 +307,8 @@ class InstantPolicyTest : public ExtensionBrowserTest, public InstantTestBase {
   DISALLOW_COPY_AND_ASSIGN(InstantPolicyTest);
 };
 
-// Flaky on Windows in the CQ: https://crbug.com/678975
-#if defined(OS_WIN)
+// Flaky on Windows in the CQ and Linux memory bot: https://crbug.com/678975
+#if defined(OS_WIN) || defined(OS_LINUX)
 #define MAYBE_SearchDoesntReuseInstantTab DISABLED_SearchDoesntReuseInstantTab
 #else
 #define MAYBE_SearchDoesntReuseInstantTab SearchDoesntReuseInstantTab