[Devtools] Remove old code

This patch removes some old code that was not used any more.

BUG=None
R=dgozman,lushnikov

Review-Url: https://codereview.chromium.org/2576203002
Cr-Commit-Position: refs/heads/master@{#438716}

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

@@ -45,8 +45,6 @@ Network.NetworkLogView = class extends UI.VBox {
 
     this._networkHideDataURLSetting = Common.settings.createSetting('networkHideDataURL', false);
     this._networkResourceTypeFiltersSetting = Common.settings.createSetting('networkResourceTypeFilters', {});
-    this._networkShowPrimaryLoadWaterfallSetting =
-        Common.settings.createSetting('networkShowPrimaryLoadWaterfall', false);
 
     this._filterBar = filterBar;
     this._progressBarContainer = progressBarContainer;
@@ -1675,9 +1673,6 @@ Network.NetworkLogView.HTTPSchemas = {
   'wss': true
 };
 
-Network.NetworkLogView._waterfallMinOvertime = 1;
-Network.NetworkLogView._waterfallMaxOvertime = 3;
-
 /** @enum {symbol} */
 Network.NetworkLogView.Events = {
   RequestSelected: Symbol('RequestSelected'),