Revert of Pass initDataType instead of contentType on OnNeedKey().

media/filters/pipeline_integration_test.cc

Index: media/filters/pipeline_integration_test.cc
diff --git a/media/filters/pipeline_integration_test.cc b/media/filters/pipeline_integration_test.cc
index 27e6344b72813bea4e56bab0f8efe5c2eee32645..d9904f611ec0d6ea29408b0984cf74840197f697 100644
--- a/media/filters/pipeline_integration_test.cc
+++ b/media/filters/pipeline_integration_test.cc
@@ -29,7 +29,6 @@
 namespace media {
 
 const char kSourceId[] = "SourceId";
-const char kCencInitDataType[] = "cenc";
 const uint8 kInitData[] = { 0x69, 0x6e, 0x69, 0x74 };
 
 const char kWebM[] = "video/webm; codecs=\"vp8,vorbis\"";
@@ -37,6 +36,8 @@
 const char kAudioOnlyWebM[] = "video/webm; codecs=\"vorbis\"";
 const char kOpusAudioOnlyWebM[] = "video/webm; codecs=\"opus\"";
 const char kVideoOnlyWebM[] = "video/webm; codecs=\"vp8\"";
+const char kMP4VideoType[] = "video/mp4";
+const char kMP4AudioType[] = "audio/mp4";
 #if defined(USE_PROPRIETARY_CODECS)
 const char kADTS[] = "audio/aac";
 const char kMP4[] = "video/mp4; codecs=\"avc1.4D4041,mp4a.40.2\"";
@@ -266,7 +267,7 @@
     // correct key ID.
     const uint8* key_id = init_data.empty() ? NULL : &init_data[0];
     size_t key_id_length = init_data.size();
-    if (type == kCencInitDataType) {
+    if (type == kMP4AudioType || type == kMP4VideoType) {
       key_id = kKeyId;
       key_id_length = arraysize(kKeyId);
     }