Revert of AudioPlayer: Update control panel with playback progress bar.

ui/file_manager/audio_player/elements/control_panel.js

Index: ui/file_manager/audio_player/elements/control_panel.js
diff --git a/ui/file_manager/audio_player/elements/control_panel.js b/ui/file_manager/audio_player/elements/control_panel.js
index 317d5c21059b4254b44311fa93477d26ff49a89d..ca7ea24079b16b6f448a595c9eff3c7533358ed9 100644
--- a/ui/file_manager/audio_player/elements/control_panel.js
+++ b/ui/file_manager/audio_player/elements/control_panel.js
@@ -99,15 +99,6 @@
         value: false,
         observer: 'volumeSliderShownChanged',
         notify: true
-      },
-
-      /**
-       * Whether the knob of time slider is being dragged.
-       */
-      dragging: {
-        type: Boolean,
-        value: false,
-        notify: true
       }
     },
 
@@ -121,14 +112,17 @@
       this.$.volumeSlider.addEventListener('focusout', onFocusoutBound);
       this.$.volumeButton.addEventListener('focusout', onFocusoutBound);
 
-      this.$.timeSlider.addEventListener('value-change', function() {
-        if (this.dragging)
-          this.dragging = false;
-      }.bind(this));
-      this.$.timeSlider.addEventListener('immediate-value-change', function() {
-        if (!this.dragging)
-          this.dragging = true;
-      }.bind(this));
+      // Prevent the time slider from being moved by arrow keys.
+      this.$.timeInput.addEventListener('keydown', function(event) {
+        switch (event.keyCode) {
+          case 37:  // Left arrow
+          case 38:  // Up arrow
+          case 39:  // Right arrow
+          case 40:  // Down arrow
+            event.preventDefault();
+            break;
+        };
+      });
     },
 
     /**
@@ -200,16 +194,6 @@
     },
 
     /**
-     * Converts the time and duration into human friendly string.
-     * @param {number} time Time to be converted.
-     * @param {number} duration Duration to be converted.
-     * @return {string} String representation of the given time
-     */
-    computeTimeString_: function(time, duration) {
-      return this.time2string_(time) + ' / ' + this.time2string_(duration);
-    },
-
-    /**
      * Computes state for play button based on 'playing' property.
      * @return {string}
      */