Hook up WebView.clearSslPreferences() for the Chromium HTTP stack

Note that this is an incomplete fix, as we do not clear the responses for
connections currently in use, as they maintain their own cache. See
http:/b/5324235.

Bug: 5287216
Change-Id: I18f6638efeff0bee1e7ffed606be1444d683bebd

core/java/android/webkit/SslCertLookupTable.java

@@ -46,4 +46,8 @@ final class SslCertLookupTable {
     public boolean isAllowed(SslError sslError) {
         return table.getBoolean(sslError.toString());
     }
+
+    public void clear() {
+        table.clear();
+    }
 }

core/java/android/webkit/WebViewCore.java

@@ -1349,8 +1349,14 @@ public final class WebViewCore {
                         }
 
                         case CLEAR_SSL_PREF_TABLE:
-                            Network.getInstance(mContext)
-                                    .clearUserSslPrefTable();
+                            if (JniUtil.useChromiumHttpStack()) {
+                                // FIXME: This will not work for connections currently in use, as
+                                // they cache the certificate responses. See http://b/5324235.
+                                SslCertLookupTable.getInstance().clear();
+                                nativeCloseIdleConnections();
+                            } else {
+                                Network.getInstance(mContext).clearUserSslPrefTable();
+                            }
                             break;
 
                         case TOUCH_UP: