media: Migrate InterbufferDistanceCB to repeating callback.

This is a repeating callback because SplitRange causes SourceBufferRange
to return a new instance of that same class, and both instances share
the callback:
* https://cs.chromium.org/chromium/src/media/filters/source_buffer_range.cc?rcl=e501b7156b763939111552df391c615761c3c1bf&l=273

This is part of the base::Callback migration.

Context: https://cs.chromium.org/chromium/src/docs/callback.md?rcl=9fcc3764aea8f97e9f6de4a9ee61d554e67edcda&l=40

Bug: 1007805
Change-Id: I9847d5ef4590bd86ec8b6c221884368d28181a6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080477
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746726}

media/filters/source_buffer_range.cc

@@ -17,15 +17,15 @@ SourceBufferRange::SourceBufferRange(
     GapPolicy gap_policy,
     const BufferQueue& new_buffers,
     base::TimeDelta range_start_pts,
-    const InterbufferDistanceCB& interbuffer_distance_cb)
+    InterbufferDistanceCB interbuffer_distance_cb)
     : gap_policy_(gap_policy),
       next_buffer_index_(-1),
-      interbuffer_distance_cb_(interbuffer_distance_cb),
+      interbuffer_distance_cb_(std::move(interbuffer_distance_cb)),
       size_in_bytes_(0),
       range_start_pts_(range_start_pts),
       keyframe_map_index_base_(0) {
   DVLOG(3) << __func__;
-  DCHECK(interbuffer_distance_cb);
+  DCHECK(interbuffer_distance_cb_);
   CHECK(!new_buffers.empty());
   DCHECK(new_buffers.front()->is_key_frame());
   AppendBuffersToEnd(new_buffers, range_start_pts_);

media/filters/source_buffer_range.h

@@ -28,7 +28,7 @@ class MEDIA_EXPORT SourceBufferRange {
   // of which this range is a part. Used to estimate the duration of a buffer if
   // its duration is not known, and in GetFudgeRoom() for determining whether a
   // time or coded frame is close enough to be considered part of this range.
-  using InterbufferDistanceCB = base::Callback<base::TimeDelta()>;
+  using InterbufferDistanceCB = base::RepeatingCallback<base::TimeDelta()>;
 
   using BufferQueue = StreamParser::BufferQueue;
 
@@ -48,7 +48,7 @@ class MEDIA_EXPORT SourceBufferRange {
   SourceBufferRange(GapPolicy gap_policy,
                     const BufferQueue& new_buffers,
                     base::TimeDelta range_start_pts,
-                    const InterbufferDistanceCB& interbuffer_distance_cb);
+                    InterbufferDistanceCB interbuffer_distance_cb);
 
   ~SourceBufferRange();