Remove ::shadow and /deep/ combinator from Files app.

ui/file_manager/file_manager/foreground/css/file_manager.css

Index: ui/file_manager/file_manager/foreground/css/file_manager.css
diff --git a/ui/file_manager/file_manager/foreground/css/file_manager.css b/ui/file_manager/file_manager/foreground/css/file_manager.css
index bd42a57dcff18926ab2ee62738bd7bcc8ea62d47..bc4e34f699609e24ff4fec6d1966c681bb04b3c7 100644
--- a/ui/file_manager/file_manager/foreground/css/file_manager.css
+++ b/ui/file_manager/file_manager/foreground/css/file_manager.css
@@ -817,26 +817,10 @@ body.check-select #search-box {
   margin-top: -4px;
 }
 
-#search-box paper-input-container /deep/ ::-webkit-input-placeholder {
+#search-box paper-input-container input::-webkit-input-placeholder {
   color: rgba(255, 255, 255, 0.5);
 }
 
-#search-box paper-input-container /deep/ .unfocused-line {
-  background-color: rgba(255, 255, 255, 0.3);
-}
-
-#search-box paper-input-container /deep/ .focused-line {
-  background-color: white;
-  height: 1px;
-}
-
-#search-box paper-input-container /deep/ .input-content ::content input {
-  color: inherit;
-  font: inherit;
-  margin: 0.5em 0 0.25em;
-  padding: 0;
-}
-
 #search-box.has-cursor,
 #search-box.has-text {
   -webkit-margin-end: 12px;
@@ -1000,18 +984,6 @@ html[dir='rtl'] #search-box .clear {
   width: 100%;
 }
 
-.dialog-footer paper-input-container /deep/ .unfocused-line {
-  background-color: rgb(207, 207, 207);
-}
-
-.dialog-footer paper-input-container /deep/ .focused-line {
-  background-color: rgb(33, 150, 243);
-}
-
-.dialog-footer paper-input-container /deep/ .input-content ::content input {
-  font: inherit;
-}
-
 .dialog-footer select {
   -webkit-appearance: none;
   background: -webkit-image-set(
@@ -1217,10 +1189,6 @@ html[dir='rtl'] .breadcrumbs .separator {
   top: 0;
 }
 
-.loading-indicator::shadow #activeProgress {
-  background-color: rgb(26, 194, 34);
-}
-
 .downloads-warning {
   align-items: center;
   background-color: rgb(49, 102, 212);