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

Reviewed by Pavel Feldman.

Merged some of memory instrumentation categories.

* dom/WebCoreMemoryInstrumentation.cpp:
(WebCore):
* inspector/front-end/NativeMemorySnapshotView.js:
(WebInspector.MemoryBlockViewProperties._initialize):
* platform/PlatformMemoryInstrumentation.cpp:
(WebCore):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142081 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Unreviewed build fix.

* UIProcess/Downloads/DownloadProxyMap.cpp:
(WebKit::DownloadProxyMap::processDidClose):
m_process can't be initialized nullptr yet. Use 0 instead of nullptr.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142082 268f45cc-cd09-0410-ab3c-d52691b4dbfc
[Qt] Unreviewed gardening. Skip failing WebGL tests.

* platform/qt/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142083 268f45cc-cd09-0410-ab3c-d52691b4dbfc