Bug 1698959: Clean up dead terminatePlugin references r=dthayer

PLUGIN_HANG events are no longer sent so terminatePlugin is unused.

Differential Revision: https://phabricator.services.mozilla.com/D113884

browser/modules/ProcessHangMonitor.jsm

@@ -131,15 +131,6 @@ var ProcessHangMonitor = {
     });
   },
 
-  /**
-   * Terminate the plugin process associated with a hang being reported
-   * for the selected browser in |win|. Will attempt to generate a combined
-   * crash report for all processes.
-   */
-  terminatePlugin(win) {
-    this.handleUserInput(win, report => report.terminatePlugin());
-  },
-
   /**
    * Dismiss the browser notification and invoke an appropriate action based on
    * the hang type.
@@ -155,9 +146,6 @@ var ProcessHangMonitor = {
         this._recordTelemetryForReport(report, "user-aborted");
         this.terminateScript(win);
         break;
-      case report.PLUGIN_HANG:
-        this.terminatePlugin(win);
-        break;
     }
   },
 
@@ -172,10 +160,6 @@ var ProcessHangMonitor = {
         report.terminateScript();
         break;
       }
-      case report.PLUGIN_HANG: {
-        report.terminatePlugin();
-        break;
-      }
     }
   },
 

mobile/android/modules/geckoview/GeckoViewProcessHangMonitor.jsm

@@ -139,10 +139,6 @@ class GeckoViewProcessHangMonitor extends GeckoViewModule {
         report.terminateScript();
         break;
       }
-      case report.PLUGIN_HANG: {
-        report.terminatePlugin();
-        break;
-      }
     }
   }