Issue #1751 - Remove Mac code behind MOZ_WIDGET_TOOLKIT == 'cocoa'

toolkit/themes/osx/global/icons/autocomplete-search.svg

@@ -1,22 +0,0 @@
-<?xml version="1.0"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 16 16">
-  <style>
-    use:not(:target) {
-      display: none;
-    }
-    use {
-      fill: GrayText;
-    }
-    use[id$="-inverted"] {
-      fill: highlighttext;
-    }
-  </style>
-  <defs>
-    <path id="search" fill-rule="evenodd" d="M14.517,12.884l-3.279-3.287c0.545-0.851,0.864-1.861,0.864-2.947 c0-3.022-2.444-5.472-5.458-5.472c-3.014,0-5.458,2.45-5.458,5.472c0,3.022,2.444,5.471,5.458,5.471 c1.093,0,2.108-0.325,2.962-0.88l3.275,3.283c0.396,0.397,1.039,0.397,1.435,0l0.202-0.202 C14.913,13.925,14.913,13.281,14.517,12.884z M6.644,10.001c-1.846,0-3.344-1.501-3.344-3.352c0-1.851,1.497-3.352,3.344-3.352 c1.847,0,3.344,1.501,3.344,3.352C9.987,8.501,8.49,10.001,6.644,10.001z"/>
-  </defs>
-  <use id="search-icon" xlink:href="#search"/>
-  <use id="search-icon-inverted" xlink:href="#search"/>
-</svg>

toolkit/themes/osx/global/icons/search-textbox.svg

@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 12 12">
-  <style>
-    path {
-      fill: #4c4c4c;
-      fill-rule: evenodd;
-    }
-  </style>
-  <path id="glyph-search" d="M11.354,10.646l-0.707.707L7.295,8A4.483,4.483,0,1,1,9,4.5,4.458,4.458,0,0,1,8,7.295ZM4.5,1A3.5,3.5,0,1,0,8,4.5,3.5,3.5,0,0,0,4.5,1Z"/>
-</svg>

toolkit/themes/osx/global/icons/searchfield-cancel.svg

@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="14" height="14" viewBox="0 0 14 14">
-  <style>
-    circle {
-      fill: #808080;
-    }
-    
-    line {
-      stroke: #fff;
-      stroke-width: 1.5px;
-    }
-  </style>
-
-  <circle cx="7" cy="7" r="7" />
-  <line x1="4" y1="4" x2="10" y2="10" />
-  <line x1="10" y1="4" x2="4" y2="10" />
-</svg>