Revert of Removing HTTPS and SOCKS proxy server code.

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index bf6d989027a0ba4757fad120b3523246668a66cb..83d9ebc3da04d300905a3cca72a5dd7e5e34a253 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -380,6 +380,8 @@ rtc_static_library("rtc_base") {
     "asyncudpsocket.h",
     "crc32.cc",
     "crc32.h",
+    "cryptstring.cc",
+    "cryptstring.h",
     "filerotatingstream.cc",
     "filerotatingstream.h",
     "fileutils.cc",
@@ -387,6 +389,11 @@ rtc_static_library("rtc_base") {
     "gunit_prod.h",
     "helpers.cc",
     "helpers.h",
+    "httpbase.cc",
+    "httpbase.h",
+    "httpcommon-inl.h",
+    "httpcommon.cc",
+    "httpcommon.h",
     "ipaddress.cc",
     "ipaddress.h",
     "messagedigest.cc",
@@ -414,6 +421,7 @@ rtc_static_library("rtc_base") {
     "opensslstreamadapter.h",
     "physicalsocketserver.cc",
     "physicalsocketserver.h",
+    "proxyinfo.cc",
     "proxyinfo.h",
     "ratelimiter.cc",
     "ratelimiter.h",
@@ -675,6 +683,8 @@ if (rtc_include_tests) {
       "firewallsocketserver.cc",
       "firewallsocketserver.h",
       "gunit.h",
+      "httpserver.cc",
+      "httpserver.h",
       "memory_usage.cc",
       "memory_usage.h",
       "natserver.cc",
@@ -828,6 +838,9 @@ if (rtc_include_tests) {
       "crc32_unittest.cc",
       "fileutils_unittest.cc",
       "helpers_unittest.cc",
+      "httpbase_unittest.cc",
+      "httpcommon_unittest.cc",
+      "httpserver_unittest.cc",
       "ipaddress_unittest.cc",
       "memory_usage_unittest.cc",
       "messagedigest_unittest.cc",
@@ -835,6 +848,7 @@ if (rtc_include_tests) {
       "nat_unittest.cc",
       "network_unittest.cc",
       "optionsfile_unittest.cc",
+      "proxy_unittest.cc",
       "ratelimiter_unittest.cc",
       "rollingaccumulator_unittest.cc",
       "rtccertificate_unittest.cc",