[omnibox] Tab switch suggestions improvements

3 small changes:
- i10n-alize hint string
- don't switch to 'this' tab
  still TODO: don't suggest 'this' tab
- push |ConvertOpenTabMatches()| to base class and
  call from HPQ and HUP

Bug: 780835
Change-Id: I16507d84e5ccedaae81028c49fd47e650ccda4ab
Reviewed-on: https://chromium-review.googlesource.com/755373
Reviewed-by: Mark Pearson <[email protected]>
Reviewed-by: Justin Donnelly <[email protected]>
Commit-Queue: Justin Donnelly <[email protected]>
Cr-Commit-Position: refs/heads/master@{#514833}
diff --git a/components/omnibox_strings.grdp b/components/omnibox_strings.grdp
index 192b592e..68c01eb 100644
--- a/components/omnibox_strings.grdp
+++ b/components/omnibox_strings.grdp
@@ -40,6 +40,9 @@
       Search or type URL
     </message>
   </if>
+  <message name="IDS_OMNIBOX_TAB_SUGGEST_HINT" desc="The text prefixing a suggestion description to say that this suggestion will switch to another tab.">
+    Switch to tab
+  </message>
   <message name="IDS_PHYSICAL_WEB_OVERFLOW_DESCRIPTION" desc="The description in the omnibox dropdown indicating that multiple nearby devices are broadcasting URLs.">
     Physical Web suggestions
   </message>