Remove heapcheck suppressions that are obsolete.
Remove heapcheck suppressions that are obsolete.

Bug 39021 and bug 43775 are for ExtensionAPIClientTest, which was
deleted: http://codereview.chromium.org/2847008

Bug 54689 was for a test that was moved from a unit test to a browser
test: http://codereview.chromium.org/6291007

Bug 39007 seems to be a catch all for RenderViewTest, but there are
no remaining RenderViewTests in unit tests (they are now all browser_tests).

BUG=39021,39007,43775,54689

Review URL: http://codereview.chromium.org/7866003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@100521 0039d316-1c4b-4281-b951-d872f2087c98

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