Revert 171178 "Allow cache reuse of some requests with Cache-Con..."

http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20ASAN/builds/12587

> Allow cache reuse of some requests with Cache-Control headers
> 
> Traditionally, we have carefully handled Cache-Control headers that were set on a ResourceResponse, but have pretended Cache-Control doesn't exist on ResourceRequests. As of http://src.chromium.org/viewvc/blink?view=rev&rev=165603, we do the smarter naive thing, and never allow resources to be reused from MemoryCache if the ResourceRequest includes a Cache-Control header.
> 
> This patch moves ResourceResponse's Cache-Control parsing to HTTPParsers and handles Cache-Control headers consistently, whether the header appears on a ResourceRequest or a ResourceResponse.
> 
> BUG=
> 
> Review URL: https://codereview.chromium.org/229053004

TBR=japhet@chromium.org

Review URL: https://codereview.chromium.org/231813004

git-svn-id: svn://svn.chromium.org/blink/trunk@171194 bbb929c8-8fbe-4397-9dbb-9b2b20218538