This adds a pref "network.http.opportunistic-encryption" that controls whether
we send an "Upgrade-Insecure-Requests : 1" header on document navigation or not.
This patch modifies the platform network parts. Default for the platform is "true".
Part 1 for #863
Potential attack: session supercookie.
[Moz Notes](https://bugzilla.mozilla.org/show_bug.cgi?id=1334776#c5):
"The problem is that for unknown header names we store the first one we see and then later we case-insensitively match against that name *globally*. That means you can track if a user agent has already seen a certain header name used (by using a different casing and observing whether it gets normalized). This would allow you to see if a user has used a sensitive service that uses custom header names, or allows you to track a user across sites, by teaching the browser about a certain header case once and then observing if different casings get normalized to that.
What we should do instead is only store the casing for a header name for each header list and not globally. That way it only leaks where it's expected (and necessary) to leak."
[Moz fix note](https://bugzilla.mozilla.org/show_bug.cgi?id=1334776#c8):
"nsHttpAtom now holds the old nsHttpAtom and a string that is case sensitive (only for not standard headers).
So nsHttpAtom holds a pointer to a header name. (header names are store on a static structure). This is how it used to be. I left that part the same but added a nsCString which holds a string that was used to resoled the header name. So when we parse headers we call ResolveHeader with a char*. If it is a new header name the char* will be stored in a HttpHeapAtom, nsHttpAtom::_val will point to HttpHeapAtom::value and the same strings will be stored in mLocalCaseSensitiveHeader. For the first resolve request they will be the same but for the following maybe not. At the end this nsHttpAtom will be stored in nsHttpHeaderArray. For all operation we will used the old char* except when we are returning it to a script using VisitHeaders."
The original code (from bug 1200802) declared an XPCOM object as a static bare pointer,
which for future reference is probably never the right thing to do. It might have worked if
it was cleared before shutdown but it never was.
This creates a number of stubs and leaves some surrounding code that may be irrelevant (eg. recorded time stamps, status variables).
Stub resolution/removal should be a follow-up to this.
In the previous code, a race condition could cause us to call SendSetPriority() after calling SendDeleteSelf.
For example:
T1: SendDeleteSelf()
T2: if (!mIPCClosed) SendSetPriority()
T1: mIPCClosed = true
MozReview-Commit-ID: 3XOwCaphb2o
--HG--
extra : rebase_source : d6e6886402d1e0b0afed23c25a9fb18d8ca29ad6
extra : intermediate-source : cfc9afe916091e6449f7d748991e2a19187dc817
extra : source : 4ebdab0e332892378558817e30d0138c95199ce5
