Mark two inspector/sources/debugger tests as slow on all platforms
Mark two inspector/sources/debugger tests as slow on all platforms

BUG=463758
TBR=pfeldman@chromium.org
NOTRY=TRUE

Review URL: https://codereview.chromium.org/980483002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191224 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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