Remove HttpStreamFactory::spdy_enabled_ static member and accessors.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 356fc944367cab5c3d9a5d4b2a3239356977bb48..37c7307101a0ac03d4759eebd1b5b03fbc183639 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -433,7 +433,8 @@ const char kDnsPrefetchingStartupList[] = "dns_prefetching.startup_list";
 const char kDnsPrefetchingHostReferralList[] =
     "dns_prefetching.host_referral_list";
 
-// Disables the SPDY protocol.
+// Disables the SPDY/3.1 protocol.
+// DEPRECATED: SPDY/3.1 is not supported any more.

[mef, 2016/07/13 18:26:32]

Is there a separate setting to disable Http/2, or is it always on?

[Bence, 2016/07/15 20:35:33]

There is no enterprice policy to disable HTTP/2.  The reason is that HTTP/2 is
not an experimental feature: the RFC has been published more than a year ago,
and it is widely used.

This policy existed because SPDY was an experimental protocol.

 const char kDisableSpdy[] = "spdy.disabled";
 
 // Prefs for persisting HttpServerProperties.