Fix incorrect dictionary lookup popover positioning when the web content's scroll position is not at the top. We were adjusting for the scroll position twice.
Fix incorrect dictionary lookup popover positioning when the web content's
scroll position is not at the top.
We were adjusting for the scroll position twice.

TEST=Navigate to a scrollable web page and scroll down so that the scroll position is no longer on top. Hover the cursor over a word and either tap with 3 fingers or invoke Cmd+Ctrl+D. A dictionary popover should appear next to the selected word where before the fix it was showing at the wrong location. Note: this feature requires Mac OS 10.8 or newer.

Review URL: https://codereview.chromium.org/226333002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@171109 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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