Remove duplicated WebGL layout tests.

third_party/WebKit/LayoutTests/fast/canvas/webgl/is-object-expected.txt

-Tests 'is' calls against non-bound and deleted objects
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
-
-PASS buffer = gl.createBuffer() was expected value: NO_ERROR.
-PASS gl.isBuffer(buffer) is false
-PASS gl.bindBuffer(gl.ARRAY_BUFFER, buffer) was expected value: NO_ERROR.
-PASS gl.isBuffer(buffer) is true
-
-PASS framebuffer = gl.createFramebuffer() was expected value: NO_ERROR.
-PASS gl.isFramebuffer(framebuffer) is false
-PASS gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer) was expected value: NO_ERROR.
-PASS gl.isFramebuffer(framebuffer) is true
-
-PASS renderbuffer = gl.createRenderbuffer() was expected value: NO_ERROR.
-PASS gl.isRenderbuffer(renderbuffer) is false
-PASS gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer) was expected value: NO_ERROR.
-PASS gl.isRenderbuffer(renderbuffer) is true
-
-PASS texture = gl.createTexture() was expected value: NO_ERROR.
-PASS gl.isTexture(texture) is false
-PASS gl.bindTexture(gl.TEXTURE_2D, texture) was expected value: NO_ERROR.
-PASS gl.isTexture(texture) is true
-
-PASS program = gl.createProgram() was expected value: NO_ERROR.
-PASS gl.isProgram(program) is true
-PASS gl.deleteProgram(program) was expected value: NO_ERROR.
-PASS gl.isProgram(program) is false
-
-PASS shader = gl.createShader(gl.VERTEX_SHADER) was expected value: NO_ERROR.
-PASS gl.isShader(shader) is true
-PASS gl.deleteShader(shader) was expected value: NO_ERROR.
-PASS gl.isShader(shader) is false
-
-PASS successfullyParsed is true
-
-TEST COMPLETE
-