Negotiate the same SRTP crypto suites for every DTLS association formed.

webrtc/pc/mediasession.h

Index: webrtc/pc/mediasession.h
diff --git a/webrtc/pc/mediasession.h b/webrtc/pc/mediasession.h
index 9474256ee3cc701b56650960d4aeaaf25ad4c365..94660a3208120e165c598c3ec606d28b16677ba5 100644
--- a/webrtc/pc/mediasession.h
+++ b/webrtc/pc/mediasession.h
@@ -613,14 +613,13 @@ VideoContentDescription* GetFirstVideoContentDescription(
 DataContentDescription* GetFirstDataContentDescription(
     SessionDescription* sdesc);
 
+// These methods are only used for SDES now.
 void GetSupportedAudioCryptoSuites(const rtc::CryptoOptions& crypto_options,
     std::vector<int>* crypto_suites);
 void GetSupportedVideoCryptoSuites(const rtc::CryptoOptions& crypto_options,
     std::vector<int>* crypto_suites);
 void GetSupportedDataCryptoSuites(const rtc::CryptoOptions& crypto_options,
     std::vector<int>* crypto_suites);
-void GetDefaultSrtpCryptoSuites(const rtc::CryptoOptions& crypto_options,
-    std::vector<int>* crypto_suites);
 void GetSupportedAudioCryptoSuiteNames(const rtc::CryptoOptions& crypto_options,
     std::vector<std::string>* crypto_suite_names);
 void GetSupportedVideoCryptoSuiteNames(const rtc::CryptoOptions& crypto_options,