Bloom filter should support longer hashes

Bloom filter should support longer hashes
https://bugs.webkit.org/show_bug.cgi?id=143419

Reviewed by Dan Bernstein.

Source/WebKit2:

Use the hash digest directly in the contents filter instead of going via shortHash.

* NetworkProcess/cache/NetworkCacheKey.h:
(WebKit::NetworkCache::Key::hash):
(WebKit::NetworkCache::Key::shortHash): Deleted.
(WebKit::NetworkCache::Key::toShortHash): Deleted.

    No longer needed.

* NetworkProcess/cache/NetworkCacheStorage.cpp:
(WebKit::NetworkCache::Storage::synchronize):
(WebKit::NetworkCache::Storage::addToContentsFilter):
(WebKit::NetworkCache::Storage::mayContain):
* NetworkProcess/cache/NetworkCacheStorage.h:

Source/WTF:

It currently supports 'unsigned' hash only which is inconvenient and doesn't have enough independent bits for larger filters.

Support arbitrarily sized hashes of type std::array<uint8_t, hashSize> (like SHA1::Digest and MD5::Digest).

* wtf/BloomFilter.h:
(WTF::BloomFilter<keyBits>::keysFromHash):
(WTF::BloomFilter<keyBits>::mayContain):
(WTF::BloomFilter<keyBits>::add):

Tools:

* TestWebKitAPI/Tests/WTF/BloomFilter.cpp:
(TestWebKitAPI::generateRandomDigests):
(TestWebKitAPI::TEST):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@182363 268f45cc-cd09-0410-ab3c-d52691b4dbfc