Disable failing PreviewsLitePageServerBrowserTest test

The following tests fail on Linux trybots:
URLLoaderImplementation/PreviewsLitePageServerBrowserTest.LitePagePreviewsTriggering/0
URLLoaderImplementation/PreviewsLitePageServerBrowserTest.ReloadingLitePagesDisablesLitePages/0

TBR=ryansturm@chromium.org

Bug: 934955
Change-Id: I9701e912909d694fe4cdbd3f2a3f8dc3c5de6723
Reviewed-on: https://chromium-review.googlesource.com/c/1483674Reviewed-by: Kristi Park <kristipark@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634827}

chrome/browser/previews/previews_lite_page_browsertest.cc

@@ -765,8 +765,9 @@ INSTANTIATE_TEST_SUITE_P(URLLoaderImplementation,
 #define DISABLE_ON_WIN_MAC(x) x
 #endif
 
+// TODO(crbug.com/934955): Failing on Linux trybots.
 IN_PROC_BROWSER_TEST_P(PreviewsLitePageServerBrowserTest,
-                       DISABLE_ON_WIN_MAC(LitePagePreviewsTriggering)) {
+                       DISABLED_LitePagePreviewsTriggering) {
   // TODO(crbug.com/874150): Use ExpectUniqueSample in these tests.
   // The histograms in these tests can only be checked by the expected bucket,
   // and not by a unique sample. This is because each navigation to a preview
@@ -1024,9 +1025,9 @@ IN_PROC_BROWSER_TEST_P(PreviewsLitePageServerBrowserTest,
   VerifyPreviewNotLoaded();
 }
 
-IN_PROC_BROWSER_TEST_P(
-    PreviewsLitePageServerBrowserTest,
-    DISABLE_ON_WIN_MAC(ReloadingLitePagesDisablesLitePages)) {
+// TODO(crbug.com/934955): Failing on Linux trybots.
+IN_PROC_BROWSER_TEST_P(PreviewsLitePageServerBrowserTest,
+                       DISABLED_ReloadingLitePagesDisablesLitePages) {
   base::test::ScopedFeatureList scoped_feature_list;
   scoped_feature_list.InitWithFeatures(
       {previews::features::kPreviewsReloadsAreSoftOptOuts}, {});