DevTools: do not clear console when preserving log

third_party/WebKit/Source/devtools/front_end/console_model/ConsoleModel.js

Index: third_party/WebKit/Source/devtools/front_end/console_model/ConsoleModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/console_model/ConsoleModel.js b/third_party/WebKit/Source/devtools/front_end/console_model/ConsoleModel.js
index ad35836ac61d2c33e12da8ba71ac39b209caff1e..d79b3503cc8b43f8f40eac3a3265a9c1dd7ced48 100644
--- a/third_party/WebKit/Source/devtools/front_end/console_model/ConsoleModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/console_model/ConsoleModel.js
@@ -162,7 +162,7 @@ ConsoleModel.ConsoleModel = class extends Common.Object {
 
     if (msg.source === ConsoleModel.ConsoleMessage.MessageSource.ConsoleAPI &&
         msg.type === ConsoleModel.ConsoleMessage.MessageType.Clear)
-      this._clear();
+      this._clearIfNecessary();
 
     this._messages.push(msg);
     var runtimeModel = msg.runtimeModel();
@@ -250,10 +250,7 @@ ConsoleModel.ConsoleModel = class extends Common.Object {
     this.addMessage(consoleMessage);
   }
 
-  /**
-   * @param {!Common.Event} event
-   */
-  _clearIfNecessary(event) {
+  _clearIfNecessary() {
     if (!Common.moduleSetting('preserveConsoleLog').get())
       this._clear();
   }