Suppress unaddressable access (use-after-free) in blink::toCoreFrame

BUG=414675
TBR=nasko@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/571403003

Cr-Commit-Position: refs/heads/master@{#295070}

tools/valgrind/drmemory/suppressions.txt

@@ -657,3 +657,12 @@ INVALID HEAP ARGUMENT
 name=http://crbug.com/413215
 *!replace_operator_delete*
 v8.dll!*
+
+UNADDRESSABLE ACCESS
+name=http://crbug.com/414675
+blink_web.dll!blink::toCoreFrame
+blink_web.dll!blink::RemoteFrameClient::firstChild
+blink_web.dll!blink::WebRemoteFrameImpl::~WebRemoteFrameImpl
+blink_web.dll!blink::WebRemoteFrameImpl::close
+content.dll!content::RenderFrameProxy::~RenderFrameProxy
+