Disable flakey test, ArchiveValidatorTest.ValidateContentUri.

This test flakes regularly on Kitkat, less often on marshmallow.

TBR=jianli@chromium.org

Bug: 1022322
Change-Id: Idca960761c3a4a56fdd2027b79a53943fe07199e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911390Reviewed-by: James MacLean <wjmaclean@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714493}

components/offline_pages/core/archive_validator_unittest.cc

@@ -168,7 +168,8 @@ TEST_F(ArchiveValidatorTest, ValidateBigFile) {
 }
 
 #if defined(OS_ANDROID)
-TEST_F(ArchiveValidatorTest, ValidateContentUri) {
+// Flaky. https://crbug.com/1022322
+TEST_F(ArchiveValidatorTest, DISABLED_ValidateContentUri) {
   base::FilePath content_uri_path = GetContentUriPathForTest();
   EXPECT_TRUE(ArchiveValidator::ValidateFile(
       content_uri_path, kSizeForTestContentUri, kExpectedDigestForContentUri));