[Telemetry] Disabling befamous in key silk cases.

It fails to scroll on android due to a functional Chrome bug.

Please revert this patch after this bug is fixed.

BUG=366371
TBR=ernstm@chromium.org

Review URL: https://codereview.chromium.org/250773009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266253 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/page_sets/key_silk_cases.py

@@ -673,4 +673,4 @@ class KeySilkCasesPageSet(page_set_module.PageSet):
     self.AddPage(Page23(self))
     self.AddPage(Page24(self))
     self.AddPage(Page25(self))
-    self.AddPage(Page26(self))
+    # self.AddPage(Page26(self))  # crbug.com/366371