Suppress the DrMemory report for an intentional RELEASE_ASSERT failure.

tools/valgrind/drmemory/suppressions_full.txt

 # This file contains suppressions for the Dr.Memory tool, see
 # http://dev.chromium.org/developers/how-tos/using-drmemory
 #
 # This file should contain suppressions only for the reports happening
 # in the 'full' mode (drmemory_full).
 # For the reports that can happen in the light mode (a.k.a. drmemory_light),
 # please use suppressions.txt instead.
 
 ###############################################################
 # Known reports on the third party we have no control over.
@@ skipping 1036 matching lines @@
 ...
 *!NSSDecryptor::~NSSDecryptor
 
 # We get uninit reports inside GMock when it prints the bytes of references to
 # partially initialized objects passed to unexpected method calls.
 UNINITIALIZED READ
 name=http://crbug.com/64887 (GMock printing uninit data)
 ...
 *!testing::*::PrintBytesInObjectTo*
 
+# This is an EXPECT_DEATH() that hits a RELEASE_ASSERT(),
+# which intentionally writes to NULL in order to crash.
+UNADDRESSABLE ACCESS
+name=https://crbug.com/497344
+blink_platform.dll!blink::SecurityOrigin::addSuborigin
+*!blink::SecurityOriginTest_Suborigins_Test::TestBody
+
 ###############################################################
 # Proactively borrowed from memcheck/suppressions.txt.
 # We have not yet seen these, but we are expanding the sets of tests
 # we're running, and we've hit redness in the past that could have
 # been avoided by already having the Memcheck suppressions.
 # TODO(bruening): review the entire file (not just these) once we're
 # at the peak set of tests we plan to run and remove the unused ones.
 
 UNINITIALIZED READ
 name=bug_101781
@@ skipping 873 matching lines @@
 
 UNINITIALIZED READ
 name=bug_493167
 system call NtWriteFile parameter #5
 KERNELBASE.dll!WriteFile
 KERNEL32.dll!WriteFile
 *!base::File::WriteAtCurrentPos
 *!sessions::SessionBackend::AppendCommandsToFile
 *!sessions::SessionBackend::AppendCommands
 *!base::internal::RunnableAdapter<>::Run