Fieldcontain: Remove deprecated ui-hide-label class

Fixes gh-6405
Closes gh-8179

Author: arschmitz

css/structure/jquery.mobile.core.css

@@ -382,19 +382,6 @@ input.ui-button-icon-only,
 }
 
 /* Accessible content hiding */
-/* ui-hide-label deprecated in 1.4. TODO: Remove in 1.5 */
-.ui-hide-label > label,
-.ui-hide-label .ui-controlgroup-label,
-.ui-hide-label .ui-rangeslider label,
-.ui-hidden-accessible,
-.ui-helper-hidden-accessible {
-	position: absolute !important;
-	height: 1px;
-	width: 1px;
-	overflow: hidden;
-	clip: rect(1px,1px,1px,1px);
-}
-
 /* Used for hiding elements by the filterable widget. You can also use this class to hide list items or buttons in controlgroups; this ensures correct corner styling. */
 .ui-screen-hidden {
 	display: none !important;

css/structure/jquery.mobile.forms.fieldcontain.css

@@ -50,14 +50,6 @@
 		-moz-box-sizing: border-box;
 		box-sizing: border-box;
 	}
-	/* ui-hide-label deprecated in 1.4. TODO: Remove in 1.5 */
-	.ui-hide-label > label ~ [class*="ui-"],
-	.ui-hide-label .ui-controlgroup-controls,
-	.ui-popup .ui-field-contain > label ~ [class*="ui-"],
-	.ui-popup .ui-field-contain .ui-controlgroup-controls {
-		float: none;
-		width: 100%;
-	}
 	.ui-field-contain > label ~ .ui-button-inline {
 		width: auto;
 		margin-right: .625em;

css/structure/jquery.mobile.forms.slider.css

@@ -152,10 +152,3 @@ div.ui-slider-switch.ui-mini {
 .ui-field-contain div.ui-slider-switch {
 	margin: 0;
 }
-/* ui-hide-label deprecated in 1.4. TODO: Remove in 1.5 */
-.ui-field-contain div.ui-slider-switch,
-.ui-field-contain.ui-hide-label div.ui-slider-switch,
-html .ui-popup .ui-field-contain div.ui-slider-switch {
-	display: inline-block;
-	width: 5.8em;
-}