Remove three flaky suppressions on Mac NVIDIA WebGL

These tests are no longer flaky
 conformance/ogles/GL/exp2/exp2_001_to_008.html (WebGL 1 and 2)
 conformance2/textures/canvas/tex-3d-rg16f-rg-float.html

Bug: 923080
Change-Id: Ibc0e4b488779a0843a787acacac6c9544e34c50f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029260
Auto-Submit: Austin Eng <enga@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737052}

content/test/gpu/gpu_tests/test_expectations/webgl2_conformance_expectations.txt

@@ -332,7 +332,6 @@ crbug.com/483282 [ mac nvidia-0xfe9 ] deqp/functional/gles3/framebufferblit/defa
 crbug.com/483282 [ mac nvidia-0xfe9 ] conformance/attribs/gl-disabled-vertex-attrib.html [ Failure ]
 crbug.com/483282 [ mac nvidia-0xfe9 ] conformance/extensions/webgl-compressed-texture-size-limit.html [ RetryOnFailure ]
 crbug.com/996344 [ mac nvidia-0xfe9 ] conformance/glsl/bugs/vector-scalar-arithmetic-inside-loop.html [ Failure ]
-crbug.com/923080 [ mac nvidia-0xfe9 ] conformance/ogles/GL/exp2/exp2_001_to_008.html [ RetryOnFailure ]
 crbug.com/483282 [ mac nvidia-0xfe9 ] conformance/programs/gl-bind-attrib-location-long-names-test.html [ Failure ]
 crbug.com/483282 [ mac nvidia-0xfe9 ] conformance/programs/gl-bind-attrib-location-test.html [ Failure ]
 crbug.com/483282 [ mac nvidia-0xfe9 no-passthrough ] conformance2/glsl3/loops-with-side-effects.html [ Failure ]
@@ -341,7 +340,6 @@ crbug.com/996344 [ mac nvidia-0xfe9 ] conformance2/textures/misc/tex-base-level-
 crbug.com/483282 [ no-angle mac nvidia-0xfe9 ] conformance2/textures/misc/tex-input-validation.html [ Failure ]
 crbug.com/996344 [ mac nvidia-0xfe9 no-passthrough ] conformance2/textures/misc/tex-mipmap-levels.html [ Failure ]
 crbug.com/682834 [ mac nvidia-0xfe9 ] conformance2/textures/image_bitmap_from_video/tex-2d-rgba16f-rgba-half_float.html [ RetryOnFailure ]
-crbug.com/922517 [ mac nvidia-0xfe9 ] conformance2/textures/canvas/tex-3d-rg16f-rg-float.html [ RetryOnFailure ]
 crbug.com/784817 [ mac nvidia-0xfe9 ] conformance/glsl/bugs/init-array-with-loop.html [ Failure ]
 crbug.com/716652 [ sierra nvidia-0xfe9 ] deqp/functional/gles3/draw/random.html [ Failure ]
 crbug.com/483282 [ mac nvidia-0xfe9 ] deqp/functional/gles3/framebufferblit/conversion_04.html [ Failure ]

content/test/gpu/gpu_tests/test_expectations/webgl_conformance_expectations.txt

@@ -317,7 +317,6 @@ crbug.com/782317 [ mac intel ] conformance/rendering/rendering-stencil-large-vie
 # Mac Retina NVidia failures
 crbug.com/635081 [ mac nvidia-0xfe9 ] conformance/attribs/gl-disabled-vertex-attrib.html [ Failure ]
 crbug.com/996344 [ mac nvidia-0xfe9 ] conformance/glsl/bugs/vector-scalar-arithmetic-inside-loop.html [ Failure ]
-crbug.com/923080 [ mac nvidia-0xfe9 ] conformance/ogles/GL/exp2/exp2_001_to_008.html [ RetryOnFailure ]
 crbug.com/635081 [ mac nvidia-0xfe9 ] conformance/programs/gl-bind-attrib-location-long-names-test.html [ Failure ]
 crbug.com/635081 [ mac nvidia-0xfe9 ] conformance/programs/gl-bind-attrib-location-test.html [ Failure ]
 crbug.com/992313 [ mac nvidia-0xfe9 ] conformance/rendering/rendering-stencil-large-viewport.html [ RetryOnFailure ]