Bug 1450017 - Part VII, Remove unused CSS rules in macOS resizer.css r=enndeakin+6102

- There is no longer any resizer[type="window] in the tree (was added in
  bug 556645)
- min-width/height was added to ensure the minimum dimensions, but
  intrinsic size of native and non-native resizer widget are already
  bigger than the size set (and there is no way to overwrite it).
  See bug 636564 comment 71.

MozReview-Commit-ID: A8uYkwoJiVy

--HG--
extra : rebase_source : c112df69b509837ea657decda16b80ed206463f7
extra : source : bab30989a50d6a8e505dee720ead93433e83ffdf

toolkit/themes/osx/global/resizer.css

@@ -9,9 +9,7 @@ resizer {
   background: url("chrome://global/skin/icons/resizer.png") no-repeat;
   background-size: 100% 100%;
   cursor: se-resize;
-  min-width: 15px;
   width: 15px;
-  min-height: 15px;
   height: 15px;
 }
 @media (min-resolution: 2dppx) {
@@ -21,10 +19,6 @@ resizer {
   }
 }
 
-resizer[type="window"] {
-  display: none;
-}
-
 resizer:-moz-locale-dir(rtl) {
   background: url("chrome://global/skin/icons/resizer-rtl.png") no-repeat;
 }
@@ -35,7 +29,6 @@ resizer:-moz-locale-dir(rtl) {
   }
 }
 
-
 resizer[dir="left"],
 resizer[dir="bottomleft"],
 resizer[dir="bottomstart"] {