Rename ZoneInfoDB -> ZoneInfoDb

Rename ZoneInfoDB -> ZoneInfoDb to conform with coding standards.

Bug: 148086409
Test: treehugger
Change-Id: I1054d129cc4d53587a187c32927311f7311754fe
diff --git a/non_openjdk_java_files.bp b/non_openjdk_java_files.bp
index 521d026..e3c8c16 100644
--- a/non_openjdk_java_files.bp
+++ b/non_openjdk_java_files.bp
@@ -258,7 +258,7 @@
         "luni/src/main/java/libcore/timezone/TimeZoneFinder.java",
         "luni/src/main/java/libcore/timezone/TzDataSetVersion.java",
         "luni/src/main/java/libcore/timezone/XmlUtils.java",
-        "luni/src/main/java/libcore/timezone/ZoneInfoDB.java",
+        "luni/src/main/java/libcore/timezone/ZoneInfoDb.java",
         "luni/src/main/java/libcore/util/ArrayUtils.java",
         "luni/src/main/java/libcore/util/BasicLruCache.java",
         "luni/src/main/java/libcore/util/CoreLibraryDebug.java",