ref(less): Remove unused popover css (#39064)

static/less/includes/bootstrap.less

@@ -12,6 +12,5 @@
 @import (reference) './bootstrap/glyphicons.less';
 @import (reference) './bootstrap/navbar.less';
 @import (reference) './bootstrap/labels.less';
-@import (reference) './bootstrap/popovers.less';
 @import (reference) './bootstrap/wells.less';
 @import (reference) './bootstrap/close.less';

static/less/includes/bootstrap/popovers.less

@@ -1,133 +0,0 @@
-//
-// Popovers
-// --------------------------------------------------
-
-.popover {
-  position: absolute;
-  top: 0;
-  left: 0;
-  z-index: @zindex-popover;
-  display: none;
-  max-width: @popover-max-width;
-  padding: 1px;
-  // Our parent element can be arbitrary since popovers are by default inserted as a sibling of their target element.
-  // So reset our font and text properties to avoid inheriting weird values.
-  .reset-text();
-  font-size: @font-size-base;
-  background-color: @popover-bg;
-  background-clip: padding-box;
-  border: 1px solid @popover-fallback-border-color;
-  border: 1px solid @popover-border-color;
-  border-radius: @border-radius-large;
-  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
-
-  // Offset the popover to account for the popover arrow
-  &.top {
-    margin-top: -@popover-arrow-width;
-  }
-  &.right {
-    margin-left: @popover-arrow-width;
-  }
-  &.bottom {
-    margin-top: @popover-arrow-width;
-  }
-  &.left {
-    margin-left: -@popover-arrow-width;
-  }
-
-  // Arrows
-  // .arrow is outer, .arrow:after is inner
-  > .arrow {
-    border-width: @popover-arrow-outer-width;
-
-    &,
-    &:after {
-      position: absolute;
-      display: block;
-      width: 0;
-      height: 0;
-      border-color: transparent;
-      border-style: solid;
-    }
-
-    &:after {
-      content: '';
-      border-width: @popover-arrow-width;
-    }
-  }
-
-  &.top > .arrow {
-    bottom: -@popover-arrow-outer-width;
-    left: 50%;
-    margin-left: -@popover-arrow-outer-width;
-    border-top-color: @popover-arrow-outer-fallback-color; // IE8 fallback
-    border-top-color: @popover-arrow-outer-color;
-    border-bottom-width: 0;
-    &:after {
-      bottom: 1px;
-      margin-left: -@popover-arrow-width;
-      content: ' ';
-      border-top-color: @popover-arrow-color;
-      border-bottom-width: 0;
-    }
-  }
-  &.right > .arrow {
-    top: 50%;
-    left: -@popover-arrow-outer-width;
-    margin-top: -@popover-arrow-outer-width;
-    border-right-color: @popover-arrow-outer-fallback-color; // IE8 fallback
-    border-right-color: @popover-arrow-outer-color;
-    border-left-width: 0;
-    &:after {
-      bottom: -@popover-arrow-width;
-      left: 1px;
-      content: ' ';
-      border-right-color: @popover-arrow-color;
-      border-left-width: 0;
-    }
-  }
-  &.bottom > .arrow {
-    top: -@popover-arrow-outer-width;
-    left: 50%;
-    margin-left: -@popover-arrow-outer-width;
-    border-top-width: 0;
-    border-bottom-color: @popover-arrow-outer-fallback-color; // IE8 fallback
-    border-bottom-color: @popover-arrow-outer-color;
-    &:after {
-      top: 1px;
-      margin-left: -@popover-arrow-width;
-      content: ' ';
-      border-top-width: 0;
-      border-bottom-color: @popover-arrow-color;
-    }
-  }
-
-  &.left > .arrow {
-    top: 50%;
-    right: -@popover-arrow-outer-width;
-    margin-top: -@popover-arrow-outer-width;
-    border-right-width: 0;
-    border-left-color: @popover-arrow-outer-fallback-color; // IE8 fallback
-    border-left-color: @popover-arrow-outer-color;
-    &:after {
-      right: 1px;
-      bottom: -@popover-arrow-width;
-      content: ' ';
-      border-right-width: 0;
-      border-left-color: @popover-arrow-color;
-    }
-  }
-}
-
-.popover-title {
-  padding: 8px 14px;
-  margin: 0; // reset heading margin
-  font-size: @font-size-base;
-  background-color: @popover-title-bg;
-  border-bottom: 1px solid darken(@popover-title-bg, 5%);
-  border-radius: (@border-radius-large - 1) (@border-radius-large - 1) 0 0;
-}
-
-.popover-content {
-  padding: 9px 14px;
-}