Web Inspector: reduce number of native memory instrumentation categories
https://bugs.webkit.org/show_bug.cgi?id=109146

Reviewed by Pavel Feldman.

Fix layout tests that started failing after r142081.

* inspector/profiler/memory-instrumentation-cached-images-expected.txt:
* inspector/profiler/memory-instrumentation-cached-images.html:
* inspector/profiler/memory-instrumentation-canvas-expected.txt:
* inspector/profiler/memory-instrumentation-canvas.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142113 268f45cc-cd09-0410-ab3c-d52691b4dbfc