Fix NPE in pauseWebViewTimers

    Bug: http://b/issue?id=3225410
    added Tab parameter to pauseWebViewTimers
    removed unnecessary activityPaused parameter
    ensure tab is not null when called
    removed pauseCurrentTab method in TabControl

    changed resumeWebViewTimers to be consistent
    removed resumeCurrentTab from TabControl

Change-Id: I1cdf6042aa4df4c832d91c5a19d7235d6dce2b5d
2 files changed