Remove duplicated WebGL layout tests.

third_party/WebKit/LayoutTests/fast/canvas/webgl/instanceof-test-expected.txt

-WebGL instanceof test.
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-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-Tests that instanceof works on WebGL objects.
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-PASS gl instanceof WebGLRenderingContext is true
-PASS gl.createBuffer() instanceof WebGLBuffer is true
-PASS gl.createFramebuffer() instanceof WebGLFramebuffer is true
-PASS gl.createProgram() instanceof WebGLProgram is true
-PASS gl.createRenderbuffer() instanceof WebGLRenderbuffer is true
-PASS gl.createShader(gl.VERTEX_SHADER) instanceof WebGLShader is true
-PASS gl.createTexture() instanceof WebGLTexture is true
-PASS gl.getUniformLocation(program, "color") instanceof WebGLUniformLocation is true
-PASS gl.getActiveAttrib(program, 0) instanceof WebGLActiveInfo is true
-PASS gl.getActiveUniform(program, 0) instanceof WebGLActiveInfo is true
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-Tests that those WebGL objects can not be constructed through new operator
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-PASS new WebGLRenderingContext threw an error
-PASS new WebGLActiveInfo threw an error
-PASS new WebGLBuffer threw an error
-PASS new WebGLFramebuffer threw an error
-PASS new WebGLProgram threw an error
-PASS new WebGLRenderbuffer threw an error
-PASS new WebGLShader threw an error
-PASS new WebGLTexture threw an error
-PASS new WebGLUniformLocation threw an error
-PASS new WebGLShaderPrecisionFormat threw an error
-PASS successfullyParsed is true
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-TEST COMPLETE
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