Revert of [cronet] Expose API to set experimental options

components/cronet/ios/Cronet.mm

Index: components/cronet/ios/Cronet.mm
diff --git a/components/cronet/ios/Cronet.mm b/components/cronet/ios/Cronet.mm
index f3bd01570081ab6f77eb8253fed4187b46e2a34c..b6aaeb13eab15f2d59f7f9b3bfd0db6a5aafc4f4 100644
--- a/components/cronet/ios/Cronet.mm
+++ b/components/cronet/ios/Cronet.mm
@@ -37,7 +37,6 @@
 cronet::URLRequestContextConfig::HttpCacheType gHttpCache =
     cronet::URLRequestContextConfig::HttpCacheType::DISK;
 ScopedVector<cronet::URLRequestContextConfig::QuicHint> gQuicHints;
-NSString* gExperimentalOptions = @"{}";
 NSString* gUserAgent = nil;
 BOOL gUserAgentPartial = NO;
 NSString* gSslKeyLogFileName = nil;
@@ -168,11 +167,6 @@
       base::SysNSStringToUTF8(host), port, altPort));
 }
 
-+ (void)setExperimentalOptions:(NSString*)experimentalOptions {
-  [self checkNotStarted];
-  gExperimentalOptions = experimentalOptions;
-}
-
 + (void)setUserAgent:(NSString*)userAgent partial:(BOOL)partial {
   [self checkNotStarted];
   gUserAgent = userAgent;
@@ -181,7 +175,7 @@
 
 + (void)setSslKeyLogFileName:(NSString*)sslKeyLogFileName {
   [self checkNotStarted];
-  gSslKeyLogFileName = [self getNetLogPathForFile:sslKeyLogFileName];
+  gSslKeyLogFileName = sslKeyLogFileName;
 }
 
 + (void)setHttpCacheType:(CRNHttpCacheType)httpCacheType {
@@ -218,8 +212,6 @@
 
   gChromeNet.Get()->set_http2_enabled(gHttp2Enabled);
   gChromeNet.Get()->set_quic_enabled(gQuicEnabled);
-  gChromeNet.Get()->set_experimental_options(
-      base::SysNSStringToUTF8(gExperimentalOptions));
   gChromeNet.Get()->set_http_cache(gHttpCache);
   gChromeNet.Get()->set_ssl_key_log_file_name(
       base::SysNSStringToUTF8(gSslKeyLogFileName));