Fix wrapping window decoration buttons in the Files.app's new UI.

chrome/browser/resources/file_manager/js/file_manager.js

Index: chrome/browser/resources/file_manager/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_manager.js b/chrome/browser/resources/file_manager/js/file_manager.js
index 7a95526baa657d6c579b48ace214b6a70a5ec264..9ff25511185e26d54c4531f1ddc88a555f5705ae 100644
--- a/chrome/browser/resources/file_manager/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_manager.js
@@ -856,6 +856,8 @@ DialogType.isModal = function(type) {
 
     this.filePopup_ = null;
 
+    this.searchBoxWrapper_ =
+        this.dialogDom_.querySelector('.search-box-wrapper');
     this.searchBox_ = this.dialogDom_.querySelector('#search-box');
     this.searchBox_.addEventListener(
         'input', this.onSearchBoxUpdate_.bind(this));
@@ -1426,6 +1428,10 @@ DialogType.isModal = function(type) {
     if (!util.platform.newUI())
       this.breadcrumbs_.truncate();
 
+    // Hide the search box if there is not enough space.
+    if (util.platform.newUI())
+      this.searchBox_.hidden = this.searchBoxWrapper_.clientWidth < 100;
+
     this.searchBreadcrumbs_.truncate();
 
     this.updateWindowState_();