Switch CandidateSession to use lists rather than vectors.

remoting/protocol/content_description_unittest.cc

Index: remoting/protocol/content_description_unittest.cc
diff --git a/remoting/protocol/content_description_unittest.cc b/remoting/protocol/content_description_unittest.cc
index 25aa8b6eda0fa7f5a71d6c56cfc1da69d850883c..4dfc0eed87994fa6511de50714b0928cc42be1d1 100644
--- a/remoting/protocol/content_description_unittest.cc
+++ b/remoting/protocol/content_description_unittest.cc
@@ -51,7 +51,7 @@ TEST(ContentDescriptionTest, ParseUnknown) {
       ContentDescription::ParseXml(xml.get()));
   ASSERT_TRUE(parsed.get());
   EXPECT_EQ(1U, parsed->config()->event_configs().size());
-  EXPECT_TRUE(parsed->config()->event_configs()[0] ==
+  EXPECT_TRUE(parsed->config()->event_configs().front() ==
               ChannelConfig(ChannelConfig::TRANSPORT_STREAM,
                             kDefaultStreamVersion,
                             ChannelConfig::CODEC_UNDEFINED));
@@ -74,7 +74,7 @@ TEST(ContentDescriptionTest, NoneTransport) {
       ContentDescription::ParseXml(xml.get()));
   ASSERT_TRUE(parsed.get());
   EXPECT_EQ(1U, parsed->config()->audio_configs().size());
-  EXPECT_TRUE(parsed->config()->audio_configs()[0] == ChannelConfig());
+  EXPECT_TRUE(parsed->config()->audio_configs().front() == ChannelConfig());
 }
 
 // Verify that we can parse configs with none transport with version and
@@ -94,7 +94,7 @@ TEST(ContentDescriptionTest, NoneTransportWithCodec) {
       ContentDescription::ParseXml(xml.get()));
   ASSERT_TRUE(parsed.get());
   EXPECT_EQ(1U, parsed->config()->audio_configs().size());
-  EXPECT_TRUE(parsed->config()->audio_configs()[0] == ChannelConfig());
+  EXPECT_TRUE(parsed->config()->audio_configs().front() == ChannelConfig());
 }
 
 }  // namespace protocol