Revert "Retry several GPU pixel tests on failure"

This reverts commit 1d05b5dd.

Reason for revert: Root cause fixed, retries should no longer be required.

Original change's description:
> Retry several GPU pixel tests on failure
> 
> Sets several GPU pixel tests on Mac and Win7 to retry on failure due to
> their configurations flakily producing valid images that haven't been
> seen in a while. This hits a known issue with Skia Gold where images
> that haven't been seen in a while aren't included in the provided
> baselines.
> 
> Bug: 983212
> Change-Id: I12fedb9b68ed811108dfd3c88821eb7838d76a56
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1698661
> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#676624}

TBR=ynovikov@chromium.org,kbr@chromium.org,bsheedy@chromium.org

Change-Id: I1997c05e799ea06f051c80806f50fc48f71d6304
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 983212
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699688Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676970}

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

-# tags: [ android chromeos highsierra linux mac mojave win win7 ]
+# tags: [ android chromeos highsierra linux mac mojave win ]
 # tags: [ android-chromium android-webview-instrumentation debug ]
 # tags: [ skia-renderer no-skia-renderer ]
 # tags: [ use-vulkan no-use-vulkan ]
 # tags: [ amd amd-0x6613 amd-0x679e amd-0x6821 intel intel-0xa2e intel-0x5912
-#         nvidia nvidia-0xfe9 nvidia-0x1cb3 qualcomm-adreno-(tm)-330
-#         qualcomm-adreno-(tm)-418 qualcomm-adreno-(tm)-420
-#         qualcomm-adreno-(tm)-430 qualcomm-adreno-(tm)-540
+#         nvidia nvidia-0xfe9 qualcomm-adreno-(tm)-330 qualcomm-adreno-(tm)-418
+#         qualcomm-adreno-(tm)-420 qualcomm-adreno-(tm)-430
+#         qualcomm-adreno-(tm)-540
 # ]
 # results: [ Failure RetryOnFailure Skip ]
 
@@ -219,14 +219,3 @@ crbug.com/969864 [ android skia-renderer use-vulkan ] Pixel_WebGLTransparentGree
 
 # Produces blank images on Intel HD 630 w/ Mesa 19.0.2
 crbug.com/976861 [ linux intel-0x5912 ] Pixel_OffscreenCanvasTransferToImageBitmap [ Skip ]
-
-# For whatever reason, these configurations are more prone to running into the
-# issue of producing valid images that haven't been seen for a long time, which
-# hits a known issue with Gold.
-crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_AA_NoAlpha [ RetryOnFailure ]
-crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_NoAA_Alpha [ RetryOnFailure ]
-crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_NoAA_NoAlpha [ RetryOnFailure ]
-crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_AA_Alpha [ RetryOnFailure ]
-crbug.com/983212 [ mac amd-0x679e ] Pixel_CSSFilterEffects_NoOverlays [ RetryOnFailure ]
-crbug.com/983212 [ win7 amd-0x6613 ] Pixel_CSS3DBlueBox [ RetryOnFailure ]
-crbug.com/983212 [ win7 nvidia-0x1cb3 ] Pixel_CSS3DBlueBox [ RetryOnFailure ]