[MD settings] adjusting heights of settings rows; removing two .css files; unifying settings layout

chrome/browser/resources/settings/appearance_page/appearance_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-button/paper-radio-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://md-settings/controls/settings_dropdown_menu.html">
 <link rel="import" href="chrome://md-settings/controls/settings_input.html">
 <link rel="import" href="chrome://md-settings/controls/settings_radio_group.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_animated_pages.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_subheader.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="appearance_fonts_page.html">
 
 <dom-module id="settings-appearance-page">
   <link rel="import" type="css"
       href="chrome://md-settings/settings_shared.css">
   <link rel="import" type="css"
       href="chrome://md-settings/appearance_page/appearance_shared.css">
   <link rel="import" type="css" href="chrome://resources/css/widgets.css">
   <link rel="import" href="chrome://resources/html/action_link.html">
   <template>
     <settings-animated-pages id="pages" current-route="{{currentRoute}}"
         section="appearance">
       <neon-animatable id="main">
-        <div class="settings-box split first">
+        <div class="settings-box first">
           <div class="start">
             <iron-icon icon="image:brightness-1"></iron-icon>
             <paper-button i18n-content="setWallpaper"></paper-button>
           </div>
           <iron-icon icon="exit-to-app" disabled></iron-icon>
         </div>
-        <div class="settings-box split">
+        <div class="settings-box">
           <div class="start">
             <iron-icon icon="image:brightness-1"></iron-icon>
             <paper-button id="get-themes"
                 on-tap="openThemesGallery_"
                 >[[i18n('getThemes')]]</paper-button>
           </div>
           <template is="dom-if" if="[[!allowResetTheme_]]">
             <iron-icon icon="exit-to-app"></iron-icon>
           </template>
           <template is="dom-if" if="[[allowResetTheme_]]">
             <paper-button on-tap="resetTheme_"
                 >[[i18n('resetToDefaultTheme')]]</paper-button>
           </template>
         </div>
-        <div class="settings-box split two-line">
+        <div class="settings-box two-line">
           <settings-checkbox class="start" i18n-values="label:showHomeButton"
               pref="{{prefs.browser.show_home_button}}">
           </settings-checkbox>
         </div>
         <template is="dom-if" if="[[prefs.browser.show_home_button.value]]">
           <div class="list-frame">
             <settings-radio-group pref="{{prefs.homepage_is_newtabpage}}">
               <paper-radio-button class="list-item" name="true">
                  [[i18n('homePageNtp')]]
               </paper-radio-button>
               <paper-radio-button class="list-item" name="false">
                 [[i18n('other')]]
                 <settings-input no-label-float pref="{{prefs.homepage}}"
                     label="[[i18n('exampleDotCom')]]">
                 </settings-input>
               </paper-radio-button>
             </settings-radio-group>
           </div>
         </template>
-        <div class="settings-box split">
+        <div class="settings-box">
           <settings-checkbox class="start" i18n-values="label:showBookmarksBar"
               pref="{{prefs.bookmark_bar.show_on_all_tabs}}">
           </settings-checkbox>
         </div>
-        <div class="settings-box split">
+        <div class="settings-box">
           <div class="start" i18n-content="fontSize"></div>
           <settings-dropdown-menu id="defaultFontSize"
               pref="{{prefs.webkit.webprefs.default_font_size}}"
               menu-options="[[fontSizeOptions_]]">
           </settings-dropdown-menu>
         </div>
-        <div class="settings-box split">
+        <div class="settings-box">
           <div class="start" i18n-content="customizeFonts"></div>
           <paper-button on-tap="onCustomizeFontsTap_"
               i18n-content="customizeFonts"></paper-button>
         </div>
-        <div class="settings-box split">
+        <div class="settings-box">
           <div class="start" i18n-content="pageZoom"></div>
           <settings-dropdown-menu id="pageZoom"
               pref="{{defaultZoomLevel_}}"
               menu-options="[[pageZoomOptions_]]">
           </settings-dropdown-menu>
         </div>
       </neon-animatable>
       <neon-animatable id="appearance-fonts">
         <settings-subheader i18n-values="page-title:customizeFonts">
         </settings-subheader>
         <template is="dom-if" if="[[showFontsPage_(currentRoute.subpage.*)]]"
             restamp>
           <settings-appearance-fonts-page prefs="{{prefs}}">
           </settings-appearance-fonts-page>
         </template>
       </neon-animatable>
     </settings-animated-pages>
   </template>
   <script src="appearance_page.js"></script>
 </dom-module>