[tracing] Rename WebMemoryDumpLevelOfDetail enums to match chromium

Non-functional refactor to match names in the chromium repo as per
crrev.com/1337943003
Just changes the names of WebMemoryDumpLevelOfDetail constants.

BUG=

Review URL: https://codereview.chromium.org/1349183002

git-svn-id: svn://svn.chromium.org/blink/trunk/public@202515 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed