Disable WebContentsSplitCacheBrowserTestEnabled.SplitCache while deflaking

This test flakily times out on Windows after https://crrev.com/667820,
which adds line tables to symbol_level=1 on Windows. Adding line tables
makes stack dumping slower, and this test intentionally crashes the
renderer 13 times, so now it times out.

TBR=jkarlin@chromium.org, jochen@chromium.org

Bug: 972990
Change-Id: Ie535e800a8260a2ff9bbdf004deb29fae0175c30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1656631Reviewed-by: Reid Kleckner <rnk@chromium.org>
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668607}

content/browser/web_contents/web_contents_impl_browsertest.cc

@@ -1100,7 +1100,15 @@ class WebContentsSplitCacheBrowserTestDisabled
   base::test::ScopedFeatureList feature_list;
 };
 
-IN_PROC_BROWSER_TEST_F(WebContentsSplitCacheBrowserTestEnabled, SplitCache) {
+// Times out on Windows for symbol_level>0, https://crbug.com/972990
+#if defined(OS_WIN)
+#define MAYBE_SplitCache DISABLED_SplitCache
+#else
+#define MAYBE_SplitCache SplitCache
+#endif
+
+IN_PROC_BROWSER_TEST_F(WebContentsSplitCacheBrowserTestEnabled,
+                       MAYBE_SplitCache) {
   // Load a cacheable resource for the first time, and it's not cached.
   EXPECT_FALSE(TestResourceLoad(GenURL("a.com", "/title1.html"), GURL()));