Don't allow deferred frames to create new windows.

New pages never defer loads, which makes it difficult for ScopedPageLoadDeferrer
to protect against synchronous loads.

This patch adds a check in ChromeClientImpl::createWindow.

BUG=616907

Review-Url: https://codereview.chromium.org/2035973002
Cr-Commit-Position: refs/heads/master@{#403640}
(cherry picked from commit 25a8ae78165cd8725465d26e02a342d7121c42f4)

Review URL: https://codereview.chromium.org/2159643002 .

Cr-Commit-Position: refs/branch-heads/2785@{#172}
Cr-Branched-From: 68623971be0cfc492a2cb0427d7f478e7b214c24-refs/heads/master@{#403382}
2 files changed