Refactor SecurityStateModel/Clients for simplicity and reusability.

components/security_state_strings.grdp

Index: components/security_state_strings.grdp
diff --git a/components/security_state_strings.grdp b/components/security_state_strings.grdp
new file mode 100644
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+++ b/components/security_state_strings.grdp
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+<?xml version="1.0" encoding="utf-8"?>
+<grit-part>
+  <!-- Strings describing Chrome security policy for DevTools security panel -->
+  <message name="IDS_PRIVATE_USER_DATA_INPUT" desc="Summary phrase for a security problem where the site collects private user data on an insecure page." translateable="false">
+    Private User Data Input
+  </message>
+  <message name="IDS_MAJOR_SHA1" desc="Summary phrase for a security problem where the site's certificate expires in 2017 or later and contains a SHA1 signature in the chain." translateable="false">
+    SHA-1 Certificate
+  </message>
+  <message name="IDS_MAJOR_SHA1_DESCRIPTION" desc="Description of a security problem where the site's certificate expires in 2017 or later and contains a SHA1 signature in the chain." translateable="false">
+    The certificate for this site expires in 2017 or later, and the certificate chain contains a certificate signed using SHA-1.
+  </message>
+  <message name="IDS_MINOR_SHA1" desc="Summary phrase for a security problem where the site's certificate expires in 2016 and contains a SHA1 signature in the chain." translateable="false">
+    SHA-1 Certificate
+  </message>
+  <message name="IDS_MINOR_SHA1_DESCRIPTION" desc="Description of a security problem where the site's certificate expires in 2016 and contains a SHA1 signature in the chain." translateable="false">
+    The certificate for this site expires in 2016, and the certificate chain contains a certificate signed using SHA-1.
+  </message>
+  <message name="IDS_CERTIFICATE_CHAIN_ERROR" desc="Summary phrase for a security problem with the site's certificate." translateable="false">
+    Certificate Error
+  </message>
+  <message name="IDS_CERTIFICATE_CHAIN_ERROR_DESCRIPTION_FORMAT" desc="Description of a security problem with the site's certificate." translateable="false">
+    There are issues with the site's certificate chain (<ph name="CERT_ERROR_DESCRIPTION">$1<ex>net::ERR_CERT_AUTHORITY_INVALID</ex></ph>).
+  </message>
+  <message name="IDS_VALID_SERVER_CERTIFICATE" desc="Summary phrase for a site that has a valid server certificate." translateable="false">
+    Valid Certificate
+  </message>
+  <message name="IDS_VALID_SERVER_CERTIFICATE_DESCRIPTION" desc="Description of a site that has a valid server certificate." translateable="false">
+    The connection to this site is using a valid, trusted server certificate.
+  </message>
+  <message name="IDS_STRONG_SSL_SUMMARY" desc="Summary phrase for a site that uses a modern, secure TLS protocol and cipher." translateable="false">
+    Secure Connection
+  </message>
+  <message name="IDS_STRONG_SSL_DESCRIPTION" desc="Description of a site that uses a modern, secure TLS protocol and cipher." translateable="false">
+    The connection to this site is encrypted and authenticated using a strong protocol (<ph name="PROTOCOL_VERSION">$1<ex>TLS 1.2</ex></ph>), a strong key exchange (<ph name="KEY_EXCHANGE">$2<ex>ECDHE_RSA</ex></ph>), and a strong cipher (<ph name="CIPHER_SUTE">$3<ex>AES_128_GCM</ex></ph>).
+  </message>
+  <message name="IDS_OBSOLETE_SSL_SUMMARY" desc="Summary phrase for a site that uses an outdated SSL settings (protocol, key exchange, or cipher)." translateable="false">
+    Obsolete Connection Settings
+  </message>
+  <message name="IDS_OBSOLETE_SSL_DESCRIPTION" desc="Description of a site that uses an outdated TLS protocol or cipher." translateable="false">
+    The connection to this site uses <ph name="A_PROTOCOL">$1<ex>an obsolete protocol</ex></ph> (<ph name="PROTOCOL">$2<ex>TLS 1.0</ex></ph>), <ph name="A_KEY_EXCHANGE">$3<ex>an obsolete key exchange</ex></ph> (<ph name="KEY_EXCHANGE">$4<ex>ECDHE_RSA</ex></ph>), and <ph name="A_CIPHER">$5<ex>an obsolete cipher</ex></ph> (<ph name="CIPHER">$6<ex>AES_256_CBC with HMAC-SHA1</ex></ph>).
+  </message>
+  <message name="IDS_CIPHER_WITH_MAC" desc="Description of an SSL cipher that contains a separate (bulk) cipher and MAC." translateable="false">
+    <ph name="CIPHER">$1<ex>AES_256_CBC</ex></ph> with <ph name="MAC">$2<ex>HMAC-SHA1</ex></ph>
+  </message>
+  <message name="IDS_SSL_AN_OBSOLETE_PROTOCOL" desc="A phrase to describe an SSL/TLS protocol (usually an older version like TLS 1.0) that is old and insecure" translateable="false">
+    an obsolete protocol
+  </message>
+  <message name="IDS_SSL_A_STRONG_PROTOCOL" desc="A phrase to describe an SSL/TLS protocol (e.g. TLS 1.2 or QUIC) that is modern and secure." translateable="false">
+    a strong protocol
+  </message>
+  <message name="IDS_SSL_AN_OBSOLETE_KEY_EXCHANGE" desc="A phrase to describe an SSL/TLS key exchange (e.g. ECDHE) that is old and insecure." translateable="false">
+    an obsolete key exchange
+  </message>
+  <message name="IDS_SSL_A_STRONG_KEY_EXCHANGE" desc="A phrase to describe an SSL/TLS key exchange (e.g. RSA) that is modern and secure." translateable="false">
+    a strong key exchange
+  </message>
+  <message name="IDS_SSL_AN_OBSOLETE_CIPHER" desc="A phrase to describe an SSL/TLS cipher (e.g. AES_256_CBC) that is old and insecure." translateable="false">
+    an obsolete cipher
+  </message>
+  <message name="IDS_SSL_A_STRONG_CIPHER" desc="A phrase to describe an SSL/TLS cipher (e.g. AES_128_GCM or ChaCha20 with Poly1305) that is modern and secure." translateable="false">
+    a strong cipher
+  </message>
+  <message name="IDS_SSL_KEY_EXCHANGE_WITH_GROUP" desc="A phrase to describe an SSL/TLS ECDHE-based key exchange with a group." translateable="false">
+    <ph name="A_KEY_EXCHANGE">$1<ex>ECDHE_RSA</ex></ph> with <ph name="A_GROUP">$2<ex>X25519</ex></ph>
+  </message>
+</grit-part>