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The associated bug seems to imply a crash on this line
ClassifyPage(controller_->GetWebContents()->GetURL())
in OmniboxEditModel::OpenMatch().

This change corrects the part of the test that may fail
(if there's no active tab for some reason).
I think controller_ is always valid (the rest of the edit
model code use it without testing it for non-NULL).
But I see at least two places in OmniboxEditModel that
test for the non-NULLness of controller_->GetWebContents().
Hence, I think it might be able to be NULL, so this
change adds a test for it here too.

TEST=new code compiles
BUG=142931


Review URL: https://chromiumcodereview.appspot.com/12250014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182244 0039d316-1c4b-4281-b951-d872f2087c98