Remove the last of the TLS fallback code.

components/pageinfo_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
   <message name="IDS_PAGE_INFO_HELP_CENTER_LINK" desc="This is the text of the link pointing to the Help Center. This appears at the bottom of the SSL dialog and 'this' refers to the sections within the bubble.">
     What do these mean?
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_DEPRECATED_SIGNATURE_ALGORITHM_MINOR" desc="The security summary phrase in the page information panel for a security problem where the site's certificate expires in 2016 and contains a SHA1 signature in the chain (as opposed to 2017 or later). Such certificates will not be supported in a future version of Chrome.">
     The certificate for this site expires in 2016, and the certificate chain contains a certificate signed using SHA-1.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_DEPRECATED_SIGNATURE_ALGORITHM_MAJOR" desc="The security summary phrase in the page information panel for a security problem where the site's certificate expires in 2017 or later and contains a SHA1 signature in the chain (as opposed to 2016). Such certificates will not be supported in a future version of Chrome.">
     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_PAGE_INFO_SECURITY_TAB_ENCRYPTED_CONNECTION_TEXT" desc="The text of the connection section when the connection is encrypted.">
     Your connection to <ph name="DOMAIN">$1<ex>www.google.com</ex></ph> is encrypted using a modern cipher suite.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_ENCRYPTED_INSECURE_CONTENT_ERROR" desc="Some extra text of the connection section when the connection is encrypted and the page contains insecure content which has been run (e.g. script).">
     Further, this page includes other resources which are not secure. These resources can be viewed by others while in transit, and can be modified by an attacker to change the behavior of the page.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_ENCRYPTED_INSECURE_CONTENT_WARNING" desc="Some extra text of the connection section when the connection is encrypted and the page contains insecure content which has been displayed (e.g. images, CSS).">
     Further, this page includes other resources which are not secure. These resources can be viewed by others while in transit, and can be modified by an attacker to change the look of the page.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_ENCRYPTED_SENTENCE_LINK" desc="Linking 2 sentences in 1 paragraph.">
     <ph name="SENTENCE1">$1<ex>Your connection is encrypted.</ex></ph> <ph name="SENTENCE2">$2<ex>However, this page includes resources from other pages whose identity cannot be verified.</ex></ph>
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_ENCRYPTION_DETAILS" desc="This message gives details of the cryptographic primitives used to protect the HTTPS connection.">
     The connection is encrypted using <ph name="CIPHER">$1<ex>AES_128</ex></ph>, with <ph name="MAC">$2<ex>HMAC-SHA1</ex></ph> for message authentication and <ph name="KX">$3<ex>RSA</ex></ph> as the key exchange mechanism.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_ENCRYPTION_DETAILS_AEAD" desc="This message gives details of the cryptographic primitives used to protect the HTTPS connection. It should be translated in a similar manner as IDS_PAGE_INFO_SECURITY_TAB_ENCRYPTION_DETAILS">
     The connection is encrypted and authenticated using <ph name="CIPHER">$1<ex>AES_128_GCM</ex></ph> and uses <ph name="KX">$2<ex>RSA</ex></ph> as the key exchange mechanism.
   </message>
-  <message name="IDS_PAGE_INFO_SECURITY_TAB_FALLBACK_MESSAGE" desc="This message is displayed when the first secure connection to a site failed and Chrome retried with an older protocol.">
-    The connection had to be retried using an older version of the TLS or SSL protocol. This typically means that the server is using very old software and may have other security issues.
-  </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_INSECURE_IDENTITY" desc="The text of the identity section when the page is not secure.">
     The identity of this website has not been verified.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_NON_UNIQUE_NAME" desc="The text of the identity section when the host is not unique (such as with Intranet host names).">
     The identity of the server you are connected to cannot be fully validated. You are connected to a server using a name only valid within your network, which an external certificate authority has no way to validate ownership of. As some certificate authorities will issue certificates for these names regardless, there is no way to ensure you are connected to the intended website and not an attacker.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_NOT_ENCRYPTED_CONNECTION_TEXT" desc="The text of the connection section when the connection is not encrypted.">
     Your connection to <ph name="DOMAIN">$1<ex>www.google.com</ex></ph> is not encrypted.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_NO_REVOCATION_MECHANISM" desc="The text of the identity section when there is no certificate revocation mechanism.">
@@ skipping 25 matching lines @@
     <message name="IDS_PAGEINFO_CERT_INFO_BUTTON" desc="Text of button in the page info that shows the SSL certificate.">
       Certificate information
     </message>
   </if>
   <if expr="use_titlecase">
     <message name="IDS_PAGEINFO_CERT_INFO_BUTTON" desc="In Title Case: Text of button in the page info that shows the SSL certificate.">
       Certificate Information
     </message>
   </if>
 </grit-part>