Add the SHA-1 deprecation string for Android page info security summary phrase.

This string will have an accompanying code change that we hope to have ready in time to merge into Chrome 42 for Android. The string needs to land early so we can kick off the translation process.

BUG=469853

Review URL: https://codereview.chromium.org/1034863003

Cr-Commit-Position: refs/heads/master@{#322291}

chrome/android/java/strings/android_chrome_strings.grd

@@ -1268,6 +1268,9 @@ You are signing in with a managed account and giving its administrator control o
       <message name="IDS_PAGE_INFO_CONNECTION_MIXED" desc="Message to display in the page info bubble when the main connection is private, but there is content on the page that is not private.">
         Your connection to this site is private, but someone on the network might be able to change the look of the page.
       </message>
+      <message name="IDS_PAGE_INFO_CONNECTION_SHA1" desc="Message to display in the page info bubble when the page is not considered private (because the connection used SHA-1 for certificate signatures, which are not considered secure anymore).">
+        This site uses a weak security configuration (SHA-1 signatures), so your connection may not be private.
+      </message>
       <message name="IDS_PAGE_INFO_CONNECTION_BROKEN_LEADING_TEXT" desc="Message to display highlighted red in the page info bubble when the connection is insecure because the HTTPS certificate is invalid.">
         Your connection to this site is not private.
       </message>