Revert of DevTools: add the logging aspect into the PerformanceMonitor

third_party/WebKit/Source/devtools/front_end/main/Main.js

Index: third_party/WebKit/Source/devtools/front_end/main/Main.js
diff --git a/third_party/WebKit/Source/devtools/front_end/main/Main.js b/third_party/WebKit/Source/devtools/front_end/main/Main.js
index 1696bdf19a133125f40ccba64bcffa62694dc8d2..63857cd80deda28b0936860fa440bd8eb1605c1c 100644
--- a/third_party/WebKit/Source/devtools/front_end/main/Main.js
+++ b/third_party/WebKit/Source/devtools/front_end/main/Main.js
@@ -1013,6 +1013,8 @@
     this._autoAttachSetting.addChangeListener(this._update, this);
     this._disableJavascriptSetting = WebInspector.settings.moduleSetting('javaScriptDisabled');
     this._disableJavascriptSetting.addChangeListener(this._update, this);
+    this._blockedEventsWarningSetting = WebInspector.settings.moduleSetting('blockedEventsWarningEnabled');
+    this._blockedEventsWarningSetting.addChangeListener(this._update, this);
     WebInspector.targetManager.observeTargets(this, WebInspector.Target.Capability.Browser);
   }
 
@@ -1020,6 +1022,9 @@
    * @param {!WebInspector.Target} target
    */
   _updateTarget(target) {
+    var blockedEventsWarningThresholdSeconds = 0.1;
+    target.pageAgent().setBlockedEventsWarningThreshold(
+        this._blockedEventsWarningSetting.get() ? blockedEventsWarningThresholdSeconds : 0);
     target.pageAgent().setAutoAttachToCreatedPages(this._autoAttachSetting.get());
     target.emulationAgent().setScriptExecutionDisabled(this._disableJavascriptSetting.get());
   }