Revert of [WebApk] Update verification keys.

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index b9714887114f3d04cbef76650238f5ab38840136..9905c4e4076a207f99485589cd05d63bbc57c7fb 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -46,17 +46,6 @@
     "min_sdk_version=16",
     "target_sdk_version=23",
   ]
-}
-
-java_cpp_template("chrome_webapk_signature_srcjar") {
-  sources = [
-    "java/src/org/chromium/chrome/browser/webapps/ChromeWebApkHostSignature.template",
-  ]
-  package_name = "org/chromium/browser/webapps"
-  inputs = [
-    "webapk/channel_keys.h",
-  ]
-  defines = [ "channel_" + android_channel ]
 }
 
 # GYP: //chrome/android/chrome_apk.gyp:chrome_sync_shell_apk_manifest
@@ -201,7 +190,6 @@
 
   srcjar_deps = [
     ":chrome_android_java_enums_srcjar",
-    ":chrome_webapk_signature_srcjar",
     ":chrome_android_java_google_api_keys_srcjar",
     ":chrome_version_srcjar",
     ":resource_id_javagen",