Reland "Add a functionally equivalent NTLMv1 implementation."

This is a reland of 24f0eb87

Fix:
- Removed 2 incorrect asserts that were reading 
  uninitialized memory in unit tests.

Original change's description:
> Add a functionally equivalent NTLMv1 implementation.
> 
> - Replacement NTLMv1 implementation.
> - In preparation for new NTLMv2 implementation.
> - Passes all unit tests and has the same behavior.
> - Adds fuzzer for NtlmClient.
> - Code is still not live.
> 
> BUG=chromium:22532
> TEST=All unit tests pass.
> 
> Change-Id: Idae533312805d21d49943fd634d54af3a93a7c00
> Reviewed-on: https://chromium-review.googlesource.com/598307
> Commit-Queue: Zentaro Kavanagh <zentaro@google.com>
> Reviewed-by: Asanka Herath <asanka@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#491611}

Bug: chromium:22532
Change-Id: I425914904d13d94214d4249ff75648775bf1c84c
Reviewed-on: https://chromium-review.googlesource.com/600388Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@google.com>
Cr-Commit-Position: refs/heads/master@{#491828}

net/BUILD.gn

@@ -1041,6 +1041,8 @@ component("net") {
       "ntlm/ntlm_buffer_reader.h",
       "ntlm/ntlm_buffer_writer.cc",
       "ntlm/ntlm_buffer_writer.h",
+      "ntlm/ntlm_client.cc",
+      "ntlm/ntlm_client.h",
       "ntlm/ntlm_constants.h",
       "proxy/dhcp_proxy_script_adapter_fetcher_win.cc",
       "proxy/dhcp_proxy_script_adapter_fetcher_win.h",
@@ -1797,6 +1799,8 @@ component("net") {
         "ntlm/ntlm_buffer_reader.h",
         "ntlm/ntlm_buffer_writer.cc",
         "ntlm/ntlm_buffer_writer.h",
+        "ntlm/ntlm_client.cc",
+        "ntlm/ntlm_client.h",
         "ntlm/ntlm_constants.h",
       ]
     }
@@ -4898,6 +4902,7 @@ test("net_unittests") {
     "ntlm/des_unittest.cc",
     "ntlm/ntlm_buffer_reader_unittest.cc",
     "ntlm/ntlm_buffer_writer_unittest.cc",
+    "ntlm/ntlm_client_unittest.cc",
     "ntlm/ntlm_test_data.h",
     "ntlm/ntlm_unittest.cc",
     "proxy/dhcp_proxy_script_adapter_fetcher_win_unittest.cc",
@@ -5316,6 +5321,7 @@ test("net_unittests") {
       "ntlm/des_unittest.cc",
       "ntlm/ntlm_buffer_reader_unittest.cc",
       "ntlm/ntlm_buffer_writer_unittest.cc",
+      "ntlm/ntlm_client_unittest.cc",
       "ntlm/ntlm_test_data.h",
       "ntlm/ntlm_unittest.cc",
     ]
@@ -5878,6 +5884,21 @@ fuzzer_test("net_http_stream_parser_fuzzer") {
   dict = "data/fuzzer_dictionaries/net_http_stream_parser_fuzzer.dict"
 }
 
+fuzzer_test("net_ntlm_ntlm_client_fuzzer") {
+  sources = [
+    "ntlm/ntlm_client_fuzzer.cc",
+  ]
+  deps = [
+    ":net_fuzzer_test_support",
+    ":test_support",
+    "//base",
+    "//net",
+    "//net:net_unittests",
+  ]
+  dict = "data/fuzzer_dictionaries/net_ntlm_ntlm_client_fuzzer.dict"
+  seed_corpus = "data/fuzzer_data/ntlm_client_fuzzer/"
+}
+
 if (!disable_brotli_filter) {
   fuzzer_test("net_brotli_source_stream_fuzzer") {
     sources = [