Auto merge of #14445 - mrnayak:netSecurity, r=jdm

Redesign CookieStorage and Implement Leave Secure Cookie Alone

CookieStorage has been refactored to use HashMap with the base domain as the key. Values of hashmap are vector of cookies.
CookieStorage now has max_per_host which restricts maximum cookies that can be added per base domain.
Cookie eviction does not take place if max_per_host is not reached.
Cookie eviction logic implemented here does following steps
1) Evict all expired cookies
2) Remove oldest accessed non-secure cookie If any
3) When no non-secure cookie exists, remove oldest accessed secure cookie if new cookie being added is secure. Else ignore new cookie

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