Remove useless decls.

These are in log.h, which is already included.

Bug: None
Test: treehugger
Change-Id: If59125e4d6e04d4cab79ad934c9a9297583cc29e
diff --git a/liblog/include/log/log_main.h b/liblog/include/log/log_main.h
index 799a8e2..3e977ef 100644
--- a/liblog/include/log/log_main.h
+++ b/liblog/include/log/log_main.h
@@ -354,15 +354,6 @@
  *        over Android.
  */
 
-/*
- * Use the per-tag properties "log.tag.<tagname>" to generate a runtime
- * result of non-zero to expose a log. prio is ANDROID_LOG_VERBOSE to
- * ANDROID_LOG_FATAL. default_prio if no property. Undefined behavior if
- * any other value.
- */
-int __android_log_is_loggable(int prio, const char* tag, int default_prio);
-int __android_log_is_loggable_len(int prio, const char* tag, size_t len, int default_prio);
-
 #if LOG_NDEBUG /* Production */
 #define android_testLog(prio, tag) \
   (__android_log_is_loggable_len(prio, tag, (tag) ? strlen(tag) : 0, ANDROID_LOG_DEBUG) != 0)