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TEST=Observed the leak and its remediation by inserting debug counter for CandidateView constructor/destructor. Verified no crash to happen by (1.Focus Omnibox 2.Enable Japanese IME 3.type "henkan" and press space key two times 4.press enter 5.type "a").
BUG=chromium-os:18893

Review URL: http://codereview.chromium.org/7741038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98931 0039d316-1c4b-4281-b951-d872f2087c98