MD WebUI: Extract settings-dialog into shared cr-dialog element

chrome/browser/resources/settings/settings_shared_css.html

Index: chrome/browser/resources/settings/settings_shared_css.html
diff --git a/chrome/browser/resources/settings/settings_shared_css.html b/chrome/browser/resources/settings/settings_shared_css.html
index bf1b2d71a5a9687b4844493f7eb3de35ea4c78fb..f865697033da757e1ffa153f698480201b571c0d 100644
--- a/chrome/browser/resources/settings/settings_shared_css.html
+++ b/chrome/browser/resources/settings/settings_shared_css.html
@@ -1,9 +1,10 @@
+<link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="/settings_root_css.html">
 
 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
-    <style>
+    <style include="cr-shared-style">
       h2 {
         align-items: center;
         display: flex;
@@ -127,29 +128,6 @@
         text-align: end;
       }
 
-      .action-button {
-        background: var(--google-blue-500);
-        color: white;
-        --paper-button-flat-keyboard-focus: {
-          background-color: rgb(58, 117, 215);  /* 88% of --google-blue-500) */
-        };
-      }
-
-      .action-button[disabled] {
-        opacity: .25;  /* TODO(dbeam): check this value with bettes. */
-      }
-
-      .cancel-button {
-        --paper-button-flat-keyboard-focus: {
-          background-color: rgba(0, 0, 0, .12);
-        };
-      }
-
-      .action-button,
-      .cancel-button {
-        font-weight: 500;
-      }
-
       /*
        * A list-frame is an outer container for list-items. It is intended to be
        * outside of a settings-box. A list-frame is likely to follow a