Revert of Certificate Transparency DNS log client

components/certificate_transparency/BUILD.gn

Index: components/certificate_transparency/BUILD.gn
diff --git a/components/certificate_transparency/BUILD.gn b/components/certificate_transparency/BUILD.gn
index 3bba1a1405953818a2344e43133f7f9fcfe994fc..15cb99f3bec238057fa97204d630b9e52d401ca3 100644
--- a/components/certificate_transparency/BUILD.gn
+++ b/components/certificate_transparency/BUILD.gn
@@ -6,8 +6,6 @@
   sources = [
     "ct_policy_manager.cc",
     "ct_policy_manager.h",
-    "log_dns_client.cc",
-    "log_dns_client.h",
     "log_proof_fetcher.cc",
     "log_proof_fetcher.h",
     "pref_names.cc",
@@ -20,7 +18,6 @@
 
   deps = [
     "//base",
-    "//components/base32",
     "//components/prefs",
     "//components/safe_json",
     "//components/url_formatter",
@@ -34,7 +31,6 @@
   testonly = true
   sources = [
     "ct_policy_manager_unittest.cc",
-    "log_dns_client_unittest.cc",
     "log_proof_fetcher_unittest.cc",
     "single_tree_tracker_unittest.cc",
   ]
@@ -45,7 +41,6 @@
     "//components/prefs:test_support",
     "//components/safe_json:test_support",
     "//net:test_support",
-    "//testing/gmock",
     "//testing/gtest",
   ]
 }