Disable MultiProfileFileManagerBrowserTest.PRE_BasicDrive because flaky.

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

Index: chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
index 0e9d776454dba7b75b9ef9d8c3e684f482494b38..1edb332ea438397bd213e05099a1a73bd0c06cb9 100644
--- a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
+++ b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
@@ -677,19 +677,20 @@ IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest,
   StartTest();
 }
 
+// Flaky: crbug.com/715961.
+// Previously it was disabled via DISABLE_SLOW_FILESAPP_TESTS and in
+// OFFICIAL_BUILD, see http://crbug.com/429294.
+IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest,
+                       DISABLED_PRE_BasicDrive) {
+  AddAllUsers();
+}
+
 // Fails on official build. http://crbug.com/429294
 #if defined(DISABLE_SLOW_FILESAPP_TESTS) || defined(OFFICIAL_BUILD)
-#define MAYBE_PRE_BasicDrive DISABLED_PRE_BasicDrive
 #define MAYBE_BasicDrive DISABLED_BasicDrive
 #else
-#define MAYBE_PRE_BasicDrive PRE_BasicDrive
 #define MAYBE_BasicDrive BasicDrive
 #endif
-IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest,
-                       MAYBE_PRE_BasicDrive) {
-  AddAllUsers();
-}
-
 IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest, MAYBE_BasicDrive) {
   AddAllUsers();