Add certificate error handling to devtools.

third_party/WebKit/Source/devtools/front_end/security/SecurityModel.js

Index: third_party/WebKit/Source/devtools/front_end/security/SecurityModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/security/SecurityModel.js b/third_party/WebKit/Source/devtools/front_end/security/SecurityModel.js
index 157f4182ef97b6a26d1dcace1d83091ea73be06a..45f281c642b0c3e8bd2bed425c4ba3d484bb28a2 100644
--- a/third_party/WebKit/Source/devtools/front_end/security/SecurityModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/security/SecurityModel.js
@@ -108,4 +108,14 @@ Security.SecurityDispatcher = class {
         securityState, schemeIsCryptographic, explanations, insecureContentStatus, summary || null);
     this._model.dispatchEventToListeners(Security.SecurityModel.Events.SecurityStateChanged, pageSecurityState);
   }
+
+
+  /**
+   * @override
+   * @param {number} eventID
+   * @param {string} errorType
+   * @param {string} requestURL
+   */
+  certificateError(eventID, errorType, requestURL) {
+  }
 };