Update WebGL conformance expectations

Remove following suppressions for Intel on Linux:

conformance/renderbuffers/depth-renderbuffer-initialization.html
conformance/renderbuffers/stencil-renderbuffer-initialization.html

BUG=794339

Change-Id: Ibf3cd5a96a22b7318730fb981dbbe7ce063f4f2e
Reviewed-on: https://chromium-review.googlesource.com/c/1309429Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Lin Sun <lin.sun@intel.com>
Cr-Commit-Position: refs/heads/master@{#607885}

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

@@ -661,13 +661,6 @@ class WebGLConformanceExpectations(GpuTestExpectations):
         'stencil-renderbuffer-initialization.html',
         ['linux', 'passthrough', 'amd'], bug=794339)
 
-    # Linux passthrough Intel
-    self.Fail('conformance/renderbuffers/' +
-        'depth-renderbuffer-initialization.html',
-        ['linux', 'passthrough', 'intel'], bug=794339)
-    self.Fail('conformance/renderbuffers/' +
-        'stencil-renderbuffer-initialization.html',
-        ['linux', 'passthrough', 'intel'], bug=794339)
     ####################
     # Android failures #
     ####################