Drop deprecated code from Less files

less/alerts.less

@@ -37,7 +37,6 @@
 //
 // Expand the right padding and account for the close button's positioning.
 
-.alert-dismissable, // The misspelled .alert-dismissable was deprecated in 3.2.0.
 .alert-dismissible {
   padding-right: (@alert-padding + 20);
 

less/mixins/hide-text.less

@@ -1,21 +1,8 @@
 // CSS image replacement
-//
-// Heads up! v3 launched with with only `.hide-text()`, but per our pattern for
-// mixins being reused as classes with the same name, this doesn't hold up. As
-// of v3.0.1 we have added `.text-hide()` and deprecated `.hide-text()`.
-//
-// Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757
-
-// Deprecated as of v3.0.1 (will be removed in v4)
-.hide-text() {
+.text-hide() {
   font: ~"0/0" a;
   color: transparent;
   text-shadow: none;
   background-color: transparent;
   border: 0;
 }
-
-// New mixin to use as of v3.0.1
-.text-hide() {
-  .hide-text();
-}

less/navs.less

@@ -106,15 +106,6 @@
       border-color: @link-color;
     }
   }
-
-  // Nav dividers (deprecated with v3.0.1)
-  //
-  // This should have been removed in v3 with the dropping of `.nav-list`, but
-  // we missed it. We don't currently support this anywhere, but in the interest
-  // of maintaining backward compatibility in case you use it, it's deprecated.
-  .nav-divider {
-    .nav-divider();
-  }
 }
 
 

less/type.less

@@ -251,11 +251,7 @@ blockquote {
     }
   }
 
-  // Note: Deprecated small and .small as of v3.1.0
-  // Context: https://github.com/twbs/bootstrap/issues/11660
-  footer,
-  small,
-  .small {
+  footer {
     display: block;
     font-size: 80%; // back to default font-size
     line-height: @line-height-base;
@@ -268,10 +264,7 @@ blockquote {
 }
 
 // Opposite alignment of blockquote
-//
-// Heads up: `blockquote.pull-right` has been deprecated as of v3.1.0.
-.blockquote-reverse,
-blockquote.pull-right {
+.blockquote-reverse {
   padding-right: 15px;
   padding-left: 0;
   border-right: 5px solid @blockquote-border-color;
@@ -279,9 +272,7 @@ blockquote.pull-right {
   text-align: right;
 
   // Account for citation
-  footer,
-  small,
-  .small {
+  footer {
     &:before { content: ''; }
     &:after {
       content: '\00A0 \2014'; // nbsp, em dash

less/utilities.less

@@ -23,10 +23,6 @@
 // Toggling content
 // -------------------------
 
-// Note: Deprecated .hide in favor of .hidden or .sr-only (as appropriate) in v3.0.1
-.hide {
-  display: none !important;
-}
 .show {
   display: block !important;
 }