Sheriff: Disable ECKIncognitoEncryptedMediaTest.FileIO

TBR=jrummell@chromium.org

Bug: 999421
Change-Id: Ia76454c22fef6b94e6e4679c6e440dc86f0a17d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808283Reviewed-by: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#697017}

chrome/browser/media/encrypted_media_browsertest.cc

@@ -964,7 +964,8 @@ IN_PROC_BROWSER_TEST_P(ECKEncryptedMediaTest, CdmProxy) {
 // save anything to disk. Instead we are only running the tests that actually
 // have the CDM do file access.
 
-IN_PROC_BROWSER_TEST_F(ECKIncognitoEncryptedMediaTest, FileIO) {
+// TODO(crbug.com/999421) Disabled due to flake on all platforms
+IN_PROC_BROWSER_TEST_F(ECKIncognitoEncryptedMediaTest, DISABLED_FileIO) {
   // Try the FileIO test using the default CDM API while running in incognito.
   TestNonPlaybackCases(kExternalClearKeyFileIOTestKeySystem, kUnitTestSuccess);
 }