Create BUILD.gn files for //media/filters.

media/filters/opus_constants.cc

Index: media/filters/opus_constants.cc
diff --git a/media/filters/opus_constants.cc b/media/filters/opus_constants.cc
index 438367d9fd8d194e603be56af1708216053f4dc2..e207514e45d3900812b755046195656d4be274f5 100644
--- a/media/filters/opus_constants.cc
+++ b/media/filters/opus_constants.cc
@@ -41,17 +41,16 @@ const uint8_t kFFmpegChannelDecodingLayouts
         {0, 2, 1, 7, 5, 6, 3, 4},
 };
 
-const uint8_t
-    kOpusVorbisChannelMap[OPUS_MAX_VORBIS_CHANNELS][OPUS_MAX_VORBIS_CHANNELS] =
-        {
-            {0},
-            {0, 1},
-            {0, 2, 1},
-            {0, 1, 2, 3},
-            {0, 4, 1, 2, 3},
-            {0, 4, 1, 2, 3, 5},
-            {0, 4, 1, 2, 3, 5, 6},
-            {0, 6, 1, 2, 3, 4, 5, 7},
+const uint8_t kOpusVorbisChannelMap[OPUS_MAX_VORBIS_CHANNELS]
+                                   [OPUS_MAX_VORBIS_CHANNELS] = {
+                                       {0},
+                                       {0, 1},
+                                       {0, 2, 1},
+                                       {0, 1, 2, 3},
+                                       {0, 4, 1, 2, 3},
+                                       {0, 4, 1, 2, 3, 5},
+                                       {0, 4, 1, 2, 3, 5, 6},
+                                       {0, 6, 1, 2, 3, 4, 5, 7},
 };
 
 }  // namespace media