Remove WTFReportAssertionFailure and WTFReportBacktrace.

third_party/WebKit/Source/wtf/Assertions.h

Index: third_party/WebKit/Source/wtf/Assertions.h
diff --git a/third_party/WebKit/Source/wtf/Assertions.h b/third_party/WebKit/Source/wtf/Assertions.h
index 392b24d8881aeb93f89cf69727cba73b6de52c96..4f9b24e207fa15ac027127735d79f10fbdd3ae06 100644
--- a/third_party/WebKit/Source/wtf/Assertions.h
+++ b/third_party/WebKit/Source/wtf/Assertions.h
@@ -50,16 +50,8 @@
 #define LOG_DISABLED !DCHECK_IS_ON()
 #endif
 
-// These helper functions are always declared, but not necessarily always
-// defined if the corresponding function is disabled.
-
-WTF_EXPORT void WTFReportAssertionFailure(const char* file,
-                                          int line,
-                                          const char* function,
-                                          const char* assertion);
 // WTFLogAlways() is deprecated. crbug.com/638849
 WTF_EXPORT PRINTF_FORMAT(1, 2) void WTFLogAlways(const char* format, ...);
-WTF_EXPORT void WTFReportBacktrace(int framesToShow = 31);
 
 namespace WTF {