content/static/html/helpers: remove not-at-latest check

The experiment was removed from the codebase, but checks in the
templates were not.

Change-Id: I993b96f77fba0cd4dbda97390c7bff9f8adac649
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/303709
Trust: Julie Qiu <julie@golang.org>
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/content/static/html/helpers/_legacy_unit_header.tmpl b/content/static/html/helpers/_legacy_unit_header.tmpl
index 86adc35..832ef13 100644
--- a/content/static/html/helpers/_legacy_unit_header.tmpl
+++ b/content/static/html/helpers/_legacy_unit_header.tmpl
@@ -83,12 +83,10 @@
                 data-ppath="{{.Unit.Path}}"
                 data-pagetype="{{.PageType}}">
               <span class="DetailsHeader-span--latest">Latest</span>
-              {{if (.Experiments.IsActive "not-at-latest")}}
-                <span class="DetailsHeader-span--notAtLatest">
-                    Latest
-                    {{template "severity_toggletip" "This package is not in the latest version of its module."}}
-                </span>
-              {{end}}
+              <span class="DetailsHeader-span--notAtLatest">
+                Latest
+                {{template "severity_toggletip" "This package is not in the latest version of its module."}}
+              </span>
               <a href="{{.LatestURL}}">Go to latest</a>
             </div>
           </span>
diff --git a/content/static/html/helpers/_unit_header.tmpl b/content/static/html/helpers/_unit_header.tmpl
index 72014c7..435168c 100644
--- a/content/static/html/helpers/_unit_header.tmpl
+++ b/content/static/html/helpers/_unit_header.tmpl
@@ -94,12 +94,10 @@
         data-ppath="{{.Unit.Path}}"
         data-pagetype="{{.PageType}}">
       <span class="DetailsHeader-span--latest">Latest</span>
-      {{if (.Experiments.IsActive "not-at-latest")}}
-        <span class="DetailsHeader-span--notAtLatest">
-          Latest
-          {{template "severity_toggletip" "This package is not in the latest version of its module."}}
-        </span>
-      {{end}}
+      <span class="DetailsHeader-span--notAtLatest">
+        Latest
+        {{template "severity_toggletip" "This package is not in the latest version of its module."}}
+      </span>
       <a href="{{.LatestURL}}">Go to latest</a>
     </div>
   </span>