Remove SWT.CHROMIUM constant

[akurtakov]

It is not doing anything, causes confusion in the API and deprecation period passed.

[github-actions]

Test Results

156 files   -    14  156 suites   - 14   11s ⏱️ - 27m 59s
 91 tests  - 4 585   91 ✅  - 4 564  0 💤  -  21  0 ❌ ±0 
377 runs   - 6 197  377 ✅  - 6 042  0 💤  - 155  0 ❌ ±0 

Results for commit f83d583. ± Comparison against base commit cc2762f.

This pull request removes 4585 tests.

org.eclipse.swt.graphics.ImageWin32Tests ‑ testDisposeDrawnImageBeforeRequestingTargetForOtherZoom
org.eclipse.swt.graphics.ImageWin32Tests ‑ testDrawImageAtDifferentZooms(boolean)[1] true
org.eclipse.swt.graphics.ImageWin32Tests ‑ testDrawImageAtDifferentZooms(boolean)[2] false
org.eclipse.swt.graphics.ImageWin32Tests ‑ testImageDataForDifferentFractionalZoomsShouldBeDifferent
org.eclipse.swt.graphics.ImageWin32Tests ‑ testImageShouldHaveDimesionAsPerZoomLevel
org.eclipse.swt.graphics.ImageWin32Tests ‑ testRetrieveImageDataAtDifferentZooms(boolean)[1] true
org.eclipse.swt.graphics.ImageWin32Tests ‑ testRetrieveImageDataAtDifferentZooms(boolean)[2] false
org.eclipse.swt.graphics.ImageWin32Tests ‑ test_getImageData_fromCopiedImage
org.eclipse.swt.graphics.ImageWin32Tests ‑ test_getImageData_fromImageForImageDataFromImage
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_dollarSign
…