Remove unused method

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=165168924

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashUtil.java

@@ -25,7 +25,6 @@ import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer2.extractor.mp4.FragmentedMp4Extractor;
 import com.google.android.exoplayer2.extractor.mp4.FragmentedMp4Extractor;
 import com.google.android.exoplayer2.source.chunk.ChunkExtractorWrapper;
 import com.google.android.exoplayer2.source.chunk.ChunkExtractorWrapper;
 import com.google.android.exoplayer2.source.chunk.InitializationChunk;
 import com.google.android.exoplayer2.source.chunk.InitializationChunk;
-import com.google.android.exoplayer2.source.dash.manifest.AdaptationSet;
 import com.google.android.exoplayer2.source.dash.manifest.DashManifest;
 import com.google.android.exoplayer2.source.dash.manifest.DashManifest;
 import com.google.android.exoplayer2.source.dash.manifest.DashManifestParser;
 import com.google.android.exoplayer2.source.dash.manifest.DashManifestParser;
 import com.google.android.exoplayer2.source.dash.manifest.Period;
 import com.google.android.exoplayer2.source.dash.manifest.Period;
@@ -66,48 +65,6 @@ public final class DashUtil {
   }
   }
 
 
   /**
   /**
-   * Loads {@link DrmInitData} for a given manifest.
-   *
-   * @param dataSource The {@link HttpDataSource} from which data should be loaded.
-   * @param dashManifest The {@link DashManifest} of the DASH content.
-   * @return The loaded {@link DrmInitData}.
-   */
-  public static DrmInitData loadDrmInitData(DataSource dataSource, DashManifest dashManifest)
-      throws IOException, InterruptedException {
-    // Prefer drmInitData obtained from the manifest over drmInitData obtained from the stream,
-    // as per DASH IF Interoperability Recommendations V3.0, 7.5.3.
-    if (dashManifest.getPeriodCount() < 1) {
-      return null;
-    }
-    Period period = dashManifest.getPeriod(0);
-    int adaptationSetIndex = period.getAdaptationSetIndex(C.TRACK_TYPE_VIDEO);
-    if (adaptationSetIndex == C.INDEX_UNSET) {
-      adaptationSetIndex = period.getAdaptationSetIndex(C.TRACK_TYPE_AUDIO);
-      if (adaptationSetIndex == C.INDEX_UNSET) {
-        return null;
-      }
-    }
-    AdaptationSet adaptationSet = period.adaptationSets.get(adaptationSetIndex);
-    if (adaptationSet.representations.isEmpty()) {
-      return null;
-    }
-    Representation representation = adaptationSet.representations.get(0);
-    DrmInitData drmInitData = representation.format.drmInitData;
-    if (drmInitData == null) {
-      Format sampleFormat = DashUtil.loadSampleFormat(dataSource, representation);
-      if (sampleFormat != null) {
-        drmInitData = sampleFormat.drmInitData;
-      }
-      if (drmInitData == null) {
-        return null;
-      }
-    }
-    return drmInitData;
-  }
-
-  /**
-   * Loads initialization data for the {@code representation} and returns the sample {@link
-   * Format}.
    * Loads {@link DrmInitData} for a given period in a DASH manifest.
    * Loads {@link DrmInitData} for a given period in a DASH manifest.
    *
    *
    * @param dataSource The {@link HttpDataSource} from which data should be loaded.
    * @param dataSource The {@link HttpDataSource} from which data should be loaded.