Revert "Support replacement of IP address resolutions via command line flag"

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index f9b674648b8e788a77a4982f0f6a0b2f435ff399..302a6b2388096339f2011c54befda17d1a837529 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -676,10 +676,6 @@ const char kIgnoreGpuBlacklist[]            = "ignore-gpu-blacklist";
 // Run the GPU process as a thread in the browser process.
 const char kInProcessGPU[]                  = "in-process-gpu";
 
-// These mappings only apply to the host resolver, and can insert additional
-// resolutions in front of resolutions that match a pattern.
-const char kIpResolverRules[]               = "ip-resolver-rules";
-
 // Specifies the flags passed to JS engine
 const char kJavaScriptFlags[]               = "js-flags";