Remove InsecureContentInfobarDelegate, which has been broken for a while

chrome/common/chrome_switches.h

 // Copyright (c) 2012 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.
 
 // Defines the shared command-line switches used by code in the Chrome
 // directory that don't have anywhere more specific to go.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
@@ skipping 167 matching lines @@
 extern const char kLoadComponentExtension[];
 extern const char kLoadExtension[];
 extern const char kMakeDefaultBrowser[];
 extern const char kMediaCacheSize[];
 extern const char kMediaRouter[];
 extern const char kMessageLoopHistogrammer[];
 extern const char kMetricsRecordingOnly[];
 extern const char kMonitoringDestinationID[];
 extern const char kNetLogCaptureMode[];
 extern const char kNoDefaultBrowserCheck[];
-extern const char kNoDisplayingInsecureContent[];
 extern const char kNoExperiments[];
 extern const char kNoFirstRun[];
 extern const char kNoPings[];
 extern const char kNoProxyServer[];
 extern const char kNoServiceAutorun[];
 extern const char kNoStartupWindow[];
 extern const char kNoSupervisedUserAcknowledgmentCheck[];
 extern const char kNumPacThreads[];
 extern const char kOpenInNewWindow[];
 extern const char kOriginalProcessStartTime[];
@@ skipping 189 matching lines @@
 #if defined(OS_CHROMEOS)
 bool PowerOverlayEnabled();
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_