Update skia handle leak suppression to handle the most recent, and be immune...

Update skia handle leak suppression to handle the most recent, and be immune to further, function name changes in SkCanvas::onDrawPosText.

TBR=thakis@chromium.org
BUG=346842

Review URL: https://codereview.chromium.org/263433002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266924 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions.txt

@@ -437,7 +437,6 @@ skia.dll!SkGlyphCache::findImage
 skia.dll!D1G_NoBounder_RectClip
 skia.dll!SkDraw::drawPosText
 skia.dll!SkBitmapDevice::drawPosText
-skia.dll!SkCanvas::onDrawPosText
 
 HANDLE LEAK
 name=http://crbug.com/346993