Version: 69e8ba23ef353ca5a06d2d9acd9da50ace03da28 refs/heads/master@{#383077}
OS: All

What steps will reproduce the problem?
(1) Build chrome or content_shell (non-official build).
(2) Run it and visit google.com.

What is the expected output?
Not implemented emitted only where this is unexpected.

What do you see instead?
[1:1:0324/134705:1131934668222:ERROR:HTMLTreeBuilder.cpp(2525)] Not implemented reached in void blink::HTMLTreeBuilder::defaultForInitial()
[1:1:0324/134705:1131934668797:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935248324:ERROR:HTMLTreeBuilder.cpp(1466)] Not implemented reached in bool blink::HTMLTreeBuilder::processBodyEndTagForInBody(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935511019:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935511251:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935511471:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935511717:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935511898:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935606457:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)
[1:1:0324/134706:1131935607020:ERROR:HTMLTreeBuilder.cpp(2466)] Not implemented reached in void blink::HTMLTreeBuilder::processEndOfFile(blink::AtomicHTMLToken *)

Either HTMLTreeBuilder is reaching unexpected code (unimplemented methods), or this is not actually an appropriate place to use NOTIMPLEMENTED(), which logs at the ERROR level in non-official builds. That's very noisy for Chromium developers.