Revert of Adding the ability to create an RtpSender without a track.

webrtc/base/helpers_unittest.cc

Index: webrtc/base/helpers_unittest.cc
diff --git a/webrtc/base/helpers_unittest.cc b/webrtc/base/helpers_unittest.cc
index 83cc68591995b5dfdcb2331e84ac0f3d006ce693..6ea0167e986327be369e02b4b012d4d9abb2fffd 100644
--- a/webrtc/base/helpers_unittest.cc
+++ b/webrtc/base/helpers_unittest.cc
@@ -43,23 +43,16 @@
   EXPECT_EQ(256U, random2.size());
 }
 
-TEST_F(RandomTest, TestCreateRandomUuid) {
-  std::string random = CreateRandomUuid();
-  EXPECT_EQ(36U, random.size());
-}
-
 TEST_F(RandomTest, TestCreateRandomForTest) {
   // Make sure we get the output we expect.
   SetRandomTestMode(true);
   EXPECT_EQ(2154761789U, CreateRandomId());
   EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
-  EXPECT_EQ("41706e92-cdd3-46d9-a22d-8ff1737ffb11", CreateRandomUuid());
 
   // Reset and make sure we get the same output.
   SetRandomTestMode(true);
   EXPECT_EQ(2154761789U, CreateRandomId());
   EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
-  EXPECT_EQ("41706e92-cdd3-46d9-a22d-8ff1737ffb11", CreateRandomUuid());
 
   // Test different character sets.
   SetRandomTestMode(true);