Removed PushSource::Packet. SeekableBuffer.current_time() fixed to return

media/base/seekable_buffer.cc

Index: media/base/seekable_buffer.cc
diff --git a/media/base/seekable_buffer.cc b/media/base/seekable_buffer.cc
index 15819c13c09f6b0623d3abe6ed2d2abe4bd626e6..f076ee80ab9c375da98dfb241e6017be14df73a5 100644
--- a/media/base/seekable_buffer.cc
+++ b/media/base/seekable_buffer.cc
@@ -17,7 +17,8 @@ SeekableBuffer::SeekableBuffer(size_t backward_capacity,
       backward_capacity_(backward_capacity),
       backward_bytes_(0),
       forward_capacity_(forward_capacity),
-      forward_bytes_(0) {
+      forward_bytes_(0),
+      current_time_(StreamSample::kInvalidTimestamp) {
   current_buffer_ = buffers_.begin();
 }
 
@@ -30,7 +31,7 @@ void SeekableBuffer::Clear() {
   current_buffer_offset_ = 0;
   backward_bytes_ = 0;
   forward_bytes_ = 0;
-  current_time_ = base::TimeDelta();
+  current_time_ = StreamSample::kInvalidTimestamp;
 }