Harder suppress WebGL 2 conformance failures on Linux AMD bots.

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
index 97f7f5c907163d2a5565e906e7bf26f3c6469fa8..d1960deb8e82b197c1ad79b2fef6b368b450169f 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -805,11 +805,11 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         ['linux', 'amd', 'no_angle'], bug=483282)
     self.Fail('conformance2/extensions/ext-color-buffer-float.html',
         ['linux', 'amd'], bug=633022)
-    self.Flaky('conformance2/buffers/uniform-buffers.html',
+    self.Fail('conformance2/buffers/uniform-buffers.html',
         ['linux', 'amd'], bug=658842)
     self.Fail('conformance2/rendering/blitframebuffer-filter-outofbounds.html',
         ['linux', 'amd'], bug=655147)
-    self.Flaky('conformance2/rendering/uniform-block-buffer-size.html',
+    self.Fail('conformance2/rendering/uniform-block-buffer-size.html',
         ['linux', 'amd'], bug=658844)
 
     # Conflicting expectations to test that the