Disable crashing unittests in background offliner.

Two unit tests are crashing a lot on Android, disabling those
tests in background_loader_offliner_unittest.cc for Android
only.

BUG=722556
TBR=dewittj@chromium.org

Review-Url: https://codereview.chromium.org/2891623002
Cr-Commit-Position: refs/heads/master@{#472286}

chrome/browser/offline_pages/background_loader_offliner_unittest.cc

@@ -236,6 +236,15 @@ void BackgroundLoaderOfflinerTest::OnCancel(const SavePageRequest& request) {
   cancel_callback_called_ = true;
 }
 
+// Two tests crash roughly 20% of runs on Android.  http://crbug.com/722556.
+#if defined(OS_ANDROID)
+#define MAYBE_FailsOnErrorPage DISABLED_FailsOnErrorPage
+#define MAYBE_NoNextOnInternetDisconnected DISABLED_NoNextOnInternetDisconnected
+#else
+#define MAYBE_FailsOnErrorPage FailsOnErrorPage
+#define MAYBE_NoNextOnInternetDisconnected NoNextOnInternetDisconnected
+#endif
+
 TEST_F(BackgroundLoaderOfflinerTest,
        LoadAndSaveBlockThirdPartyCookiesForCustomTabs) {
   base::Time creation_time = base::Time::Now();
@@ -464,7 +473,7 @@ TEST_F(BackgroundLoaderOfflinerTest, ReturnsOnWebContentsDestroyed) {
   EXPECT_EQ(Offliner::RequestStatus::LOADING_FAILED, request_status());
 }
 
-TEST_F(BackgroundLoaderOfflinerTest, FailsOnErrorPage) {
+TEST_F(BackgroundLoaderOfflinerTest, MAYBE_FailsOnErrorPage) {
   base::Time creation_time = base::Time::Now();
   SavePageRequest request(kRequestId, kHttpUrl, kClientId, creation_time,
                           kUserRequested);
@@ -489,7 +498,7 @@ TEST_F(BackgroundLoaderOfflinerTest, FailsOnErrorPage) {
   EXPECT_EQ(Offliner::RequestStatus::LOADING_FAILED, request_status());
 }
 
-TEST_F(BackgroundLoaderOfflinerTest, NoNextOnInternetDisconnected) {
+TEST_F(BackgroundLoaderOfflinerTest, MAYBE_NoNextOnInternetDisconnected) {
   base::Time creation_time = base::Time::Now();
   SavePageRequest request(kRequestId, kHttpUrl, kClientId, creation_time,
                           kUserRequested);