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When we sync tilings, we always expect to sync the high res
tiling. However, in situations where our minimum contents scale
prevents us from syncing the high res tiling, we should instead
reset the raster contents scale, since those would be invalid
as well. This also ensures that we will create a new high res
tiling when we call ManageTilings.

BUG=374143
R=enne

Review URL: https://codereview.chromium.org/294463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271527 0039d316-1c4b-4281-b951-d872f2087c98