Modifications for recording whether UMA/Crash default state for iOS

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 4895538e928ab4157e0ae6109e8126f27288bae5..70a940fd9e4c00de4936a4bec3960ddb6f7abd92 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1268,13 +1268,6 @@ const char kCrashReportingEnabled[] =
     "user_experience_metrics_crash.reporting_enabled";
 #endif
 
-// An enum value indicating the default value of the enable metrics reporting
-// checkbox shown during first-run. If it's opt-in, then the checkbox defaulted
-// to unchecked, if it's opt-out, then it defaulted to checked. This value is
-// only recorded during first-run, so older clients will not set it. The enum
-// used for the value is metrics::MetricsServiceClient::EnableMetricsDefault.
-const char kMetricsDefaultOptIn[] = "user_experience_metrics.default_opt_in";
-
 // This is the location of a list of dictionaries of plugin stability stats.
 const char kStabilityPluginStats[] =
     "user_experience_metrics.stability.plugin_stats2";