GitLab

Remove ResourceMetadataStorage::PutCacheEntry, RemoveCacheEntry and GetCacheEntryIterator. (GetCacheEntry is kept for tests)
FileCache::ClearAll is only responsible to delete files.

BUG=275271
TEST=unit_tests

Review URL: https://codereview.chromium.org/296463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271664 0039d316-1c4b-4281-b951-d872f2087c98