Disable DownloadTestWithHistogramTester.SavePageNonHTMLViaGet on Linux because it's flaky.

TBR=svaldez@chromium.org

Bug: 1028371
Change-Id: I0f084e3263c756bfe59502e359d2dac979efbcee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937658Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719341}

chrome/browser/download/download_browsertest.cc

@@ -2608,7 +2608,14 @@ class DownloadTestWithHistogramTester : public DownloadTest {
   std::unique_ptr<URLLoaderInterceptor> url_loader_interceptor_;
 };
 
-IN_PROC_BROWSER_TEST_F(DownloadTestWithHistogramTester, SavePageNonHTMLViaGet) {
+#if defined(OS_LINUX)
+#define MAYBE_SavePageNonHTMLViaGet DISABLED_SavePageNonHTMLViaGet
+#else
+#define MAYBE_SavePageNonHTMLViaGet SavePageNonHTMLViaGet
+#endif
+
+IN_PROC_BROWSER_TEST_F(DownloadTestWithHistogramTester,
+                       MAYBE_SavePageNonHTMLViaGet) {
   embedded_test_server()->ServeFilesFromDirectory(GetTestDataDirectory());
   ASSERT_TRUE(embedded_test_server()->Start());
   EnableFileChooser(true);