diff --git a/double-conversion/utils.h b/double-conversion/utils.h
--- a/double-conversion/utils.h
+++ b/double-conversion/utils.h
@@ -36,27 +36,29 @@
 
 // For pre-C++11 compatibility
 #if __cplusplus >= 201103L
 #define DOUBLE_CONVERSION_NULLPTR nullptr
 #else
 #define DOUBLE_CONVERSION_NULLPTR NULL
 #endif
 
-#include <cassert>
+#include "mozilla/Assertions.h"
+
 #ifndef DOUBLE_CONVERSION_ASSERT
 #define DOUBLE_CONVERSION_ASSERT(condition)         \
-    assert(condition)
+    MOZ_ASSERT(condition)
 #endif
 #if defined(DOUBLE_CONVERSION_NON_PREFIXED_MACROS) && !defined(ASSERT)
 #define ASSERT DOUBLE_CONVERSION_ASSERT
 #endif
 
 #ifndef DOUBLE_CONVERSION_UNIMPLEMENTED
-#define DOUBLE_CONVERSION_UNIMPLEMENTED() (abort())
+#define DOUBLE_CONVERSION_UNIMPLEMENTED() \
+    MOZ_CRASH("DOUBLE_CONVERSION_UNIMPLEMENTED")
 #endif
 #if defined(DOUBLE_CONVERSION_NON_PREFIXED_MACROS) && !defined(UNIMPLEMENTED)
 #define UNIMPLEMENTED DOUBLE_CONVERSION_UNIMPLEMENTED
 #endif
 
 #ifndef DOUBLE_CONVERSION_NO_RETURN
 #ifdef _MSC_VER
 #define DOUBLE_CONVERSION_NO_RETURN __declspec(noreturn)
@@ -66,20 +68,21 @@
 #endif
 #if defined(DOUBLE_CONVERSION_NON_PREFIXED_MACROS) && !defined(NO_RETURN)
 #define NO_RETURN DOUBLE_CONVERSION_NO_RETURN
 #endif
 
 #ifndef DOUBLE_CONVERSION_UNREACHABLE
 #ifdef _MSC_VER
 void DOUBLE_CONVERSION_NO_RETURN abort_noreturn();
-inline void abort_noreturn() { abort(); }
+inline void abort_noreturn() { MOZ_CRASH("abort_noreturn"); }
 #define DOUBLE_CONVERSION_UNREACHABLE()   (abort_noreturn())
 #else
-#define DOUBLE_CONVERSION_UNREACHABLE()   (abort())
+#define DOUBLE_CONVERSION_UNREACHABLE()   \
+    MOZ_CRASH("DOUBLE_CONVERSION_UNREACHABLE")
 #endif
 #endif
 #if defined(DOUBLE_CONVERSION_NON_PREFIXED_MACROS) && !defined(UNREACHABLE)
 #define UNREACHABLE DOUBLE_CONVERSION_UNREACHABLE
 #endif
 
 // Not all compilers support __has_attribute and combining a check for both
 // ifdef and __has_attribute on the same preprocessor line isn't portable.