[HBD] Hardcode SEI threshold to 30 (for testers)

chrome/browser/plugins/plugins_field_trial.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/plugins/plugins_field_trial.h"
 
 #include "base/feature_list.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/common/chrome_features.h"
 #include "components/variations/variations_associated_data.h"
 
 namespace {
 
 // The default site engagement threshold to allow Flash to be presented as an
-// available plugin.
-const double kSiteEngagementThresholdForFlash = 1.0;
+// available plugin. This value is not used for normal uses, but only for
+// developers / testers that don't have a field trial configuration.
+const double kDefaultSiteEngagementThresholdForFlash = 30.0;
 
 }  // namespace
 
 // static
 const char* PluginsFieldTrial::kSiteEngagementThresholdForFlashKey =
     "engagement_threshold_for_flash";
 
 // static
 ContentSetting PluginsFieldTrial::EffectiveContentSetting(
     ContentSettingsType type,
@@ skipping 11 matching lines @@
 }
 
 // static
 double PluginsFieldTrial::GetSiteEngagementThresholdForFlash() {
   double threshold = -1;
   std::string param = variations::GetVariationParamValueByFeature(
       features::kPreferHtmlOverPlugins,
       PluginsFieldTrial::kSiteEngagementThresholdForFlashKey);
   if (base::StringToDouble(param, &threshold) && threshold >= 0)
     return threshold;
-  return kSiteEngagementThresholdForFlash;
+  return kDefaultSiteEngagementThresholdForFlash;
 }