[MD settings] hyphenate image-set

This CL changes label imageset to image-set (or ImageSet), because afaik
image-set is a html/css concept and imageset is not.

TBR=tommycli@chromium.org

Bug: None
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Iac23276f11b27f8863b3f7aaf864c8986f647fd9
Reviewed-on: https://chromium-review.googlesource.com/582194
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488814}

chrome/browser/resources/settings/people_page/people_page.html

@@ -98,7 +98,7 @@
         <div id="picture-subpage-trigger" class="settings-box first two-line">
           <template is="dom-if" if="[[syncStatus]]">
             <div id="profile-icon" on-tap="onPictureTap_" actionable
-                style="background-image: [[getIconImageset_(profileIconUrl_)]]">
+                style="background-image: [[getIconImageSet_(profileIconUrl_)]]">
             </div>
 <if expr="not chromeos">
             <div class="middle two-line no-min-width"

chrome/browser/resources/settings/people_page/people_page.js

@@ -454,10 +454,10 @@ Polymer({
 
   /**
    * @param {string} iconUrl
-   * @return {string} A CSS imageset for multiple scale factors.
+   * @return {string} A CSS image-set for multiple scale factors.
    * @private
    */
-  getIconImageset_: function(iconUrl) {
+  getIconImageSet_: function(iconUrl) {
     return cr.icon.getImage(iconUrl);
   },
 

ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector.html

@@ -44,7 +44,7 @@
         ignore-modified-key-events="[[ignoreModifiedKeyEvents]]">
       <template is="dom-repeat" items="[[avatars]]">
         <paper-button class="avatar" title="[[item.label]]"
-            style$="background-image: [[getIconImageset_(item.url)]]"
+            style$="background-image: [[getIconImageSet_(item.url)]]"
             on-tap="onAvatarTap_">
         </paper-button>
       </template>

ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector.js

@@ -49,10 +49,10 @@ Polymer({
 
   /**
    * @param {string} iconUrl
-   * @return {string} A CSS imageset for multiple scale factors.
+   * @return {string} A CSS image-set for multiple scale factors.
    * @private
    */
-  getIconImageset_: function(iconUrl) {
+  getIconImageSet_: function(iconUrl) {
     return cr.icon.getImage(iconUrl);
   },