MD Settings: About: Fixes to channel switcher dialog

BUG=666876
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2563143002
Cr-Commit-Position: refs/heads/master@{#438038}

chrome/app/settings_strings.grdp

@@ -86,6 +86,15 @@
     <message name="IDS_SETTINGS_ABOUT_PAGE_UNSTABLE_WARNING_TITLE" desc="The title of the warning about switching to developer (unstable) channel.">
       Warning: you are switching to developer channel
     </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_STABLE" desc="The stable option in the channel select.">
+      Stable
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_BETA" desc="The beta option in the channel select.">
+      Beta
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_DEV" desc="The development option in the channel select.">
+      Developer - unstable
+    </message>
   </if>
   <if expr="not chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_RELAUNCH" desc="The label for the relaunch button that relaunches the browser once update is complete">

chrome/browser/resources/settings/about_page/channel_switcher_dialog.html

@@ -9,7 +9,11 @@
 
 <dom-module id="settings-channel-switcher-dialog">
   <template>
-    <style include="settings-shared"></style>
+    <style include="settings-shared">
+      dialog {
+        width: 600px;
+      }
+    </style>
     <dialog is="cr-dialog" id="dialog">
       <div class="title">$i18n{aboutChangeChannel}</div>
       <div class="body">
@@ -19,13 +23,13 @@
         <paper-radio-group
             on-paper-radio-group-changed="onChannelSelectionChanged_">
           <paper-radio-button name="[[browserChannelEnum_.STABLE]]">
-            $i18n{aboutChannelStable}
+            $i18n{aboutChannelDialogStable}
           </paper-radio-button>
           <paper-radio-button name="[[browserChannelEnum_.BETA]]">
-            $i18n{aboutChannelBeta}
+            $i18n{aboutChannelDialogBeta}
           </paper-radio-button>
           <paper-radio-button name="[[browserChannelEnum_.DEV]]">
-            $i18n{aboutChannelDev}
+            $i18n{aboutChannelDialogDev}
           </paper-radio-button>
         </paper-radio-group>
         <div id="warning" hidden="[[!shouldShowWarning_(warning_)]]">

chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

@@ -237,6 +237,9 @@ void AddAboutStrings(content::WebUIDataSource* html_source) {
      IDS_SETTINGS_ABOUT_PAGE_UNSTABLE_WARNING_MESSAGE},
     {"aboutUnstableWarningTitle",
      IDS_SETTINGS_ABOUT_PAGE_UNSTABLE_WARNING_TITLE},
+    {"aboutChannelDialogBeta", IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_BETA},
+    {"aboutChannelDialogDev", IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_DEV},
+    {"aboutChannelDialogStable", IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_STABLE},
 #endif
   };
   AddLocalizedStringsBulk(html_source, localized_strings,