chromecast: media: Fix Java warnings [MultiVariableDeclaration]

../../chromecast/media/cma/backend/android/java/src/org/chromium/chromecast/cma/backend/android/VolumeMap.java:173: warning: [MultiVariableDeclaration] Variable declarations should declare only one variable
        float dbLeft = dbMin, dbRight = dbMin;
              ^
    (see https://google.github.io/styleguide/javaguide.html#s4.8.2.1-variables-per-declaration)
  Did you mean 'float dbLeft = dbMin;float dbRight = dbMin;'?
1 warning

Bug: b/145737017

Change-Id: I78ce6063a36e86a6959e013a480a863792bfdc49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1959797
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Auto-Submit: Michael Spang <spang@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723420}

chromecast/media/cma/backend/android/java/src/org/chromium/chromecast/cma/backend/android/VolumeMap.java

@@ -170,7 +170,8 @@ public final class VolumeMap {
         // There are only a few volume index steps, so simply loop through them
         // and find the interval [dbLeft .. dbRight] that contains db, then
         // interpolate to estimate the volume level to return.
-        float dbLeft = dbMin, dbRight = dbMin;
+        float dbLeft = dbMin;
+        float dbRight = dbMin;
         int idx = minIndex + 1;
         for (; idx <= maxIndex; idx++) {
             dbLeft = dbRight;