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One (1!) line fix to remove Valgrind issue. Original review https://codereview.chromium.org/543753002/

Keeps the fetcher functionality as ImageFetcherImpl in chrome/browser/search/suggestions.

BUG=387751
TBR=blundell
TEST=ImageManagerTest,ImageFetcherBrowserTest

Review URL: https://codereview.chromium.org/607183002

Cr-Commit-Position: refs/heads/master@{#297177}