Remove obsolete suppressions.
Remove obsolete suppressions.

1) The stack has LegacyHTMLTreeConstructor in it.  This code was deleted
months ago.
2) The test moved from a unit test to a browser test so it's no longer
covered by the memory bots.
3) The unit and test_shell steps of the current bot doesn't show this
suppression being hit.

BUG=46658

Review URL: http://codereview.chromium.org/7858016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@100416 0039d316-1c4b-4281-b951-d872f2087c98

gavinp/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,ropik/chromium