Removing unnecessary DCHECK from SafeBrowsing interstitial.

BUG=30079
TEST=None.

Review URL: http://codereview.chromium.org/1131003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42049 0039d316-1c4b-4281-b951-d872f2087c98
    InterstitialPageRVHViewDelegate(InterstitialPage* page)
    : interstitial_page_(page) {
}

    InterstitialPageRVHViewDelegate(InterstitialPage* page)
    : interstitial_page_(page) {
}
