[DevTools] Rename View to Widget.

Source/devtools/front_end/inspectorCommon.css

 body /deep/ * {
     /* This is required for correct sizing of flex items because we rely
      * on an old version of the flexbox spec.
      * Longer-term we should remove this, see crbug.com/473625 */
     min-width: 0;
     min-height: 0;
 }
 
 html {
     height: 100%;
@@ skipping 84 matching lines @@
     left: 0;
     right: 0;
     bottom: 0;
 }
 
 body /deep/ iframe.fill {
     width: 100%;
     height: 100%;
 }
 
-body /deep/ .view {
+body /deep/ .widget {
     position: relative;
     flex: auto;
 }
 
 body /deep/ .hbox {
     display: flex;
     flex-direction: row !important;
     position: relative;
 }
 
@@ skipping 10 matching lines @@
 body /deep/ .flex-none {
     flex: none;
 }
 
 body /deep/ .flex-centered {
     display: flex;
     align-items: center;
     justify-content: center;
 }
 
-body /deep/ iframe.view {
+body /deep/ iframe.widget {
     position: absolute;
     width: 100%;
     height: 100%;
     left: 0;
     right: 0;
     top: 0;
     bottom: 0;
 }
 
 body /deep/ .hidden {
@@ skipping 34 matching lines @@
 html /deep/ .highlighted-search-result.current-search-result {
     border-radius: 1px;
     padding: 1px;
     margin: -1px;
     background-color: rgba(255, 127, 0, 0.8);
 }
 
 .overflow-auto {
     overflow: auto;
 }