Remove duplicated WebGL layout tests.

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

-This tests framebuffer/renderbuffer-related functions
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-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-Canvas.getContext
-PASS context exists
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-Checking framebuffer/renderbuffer stuff.
-PASS calling getFramebufferAttachmentParameter on the default framebuffer should generate INVALID_OPERATION.
-PASS calling checkFramebufferStatus on the default framebuffer should generate FRAMEBUFFER_COMPLETE.
-PASS trying to attach a texture to default framebuffer should generate INVALID_OPERATION.
-PASS trying to detach default renderbuffer from default framebuffer should generate INVALID_OPERATION.
-PASS allocating renderbuffer storage of a newly created renderbuffer should succeed.
-PASS trying to attach a renderbuffer to the default framebuffer should generate INVALID_OPERATION.
-PASS binding a newly created framebuffer should succeed.
-PASS calling getFramebufferAttachmentParameter with target = READ_FRAMEBUFFER should generate INVALID_ENUM.
-PASS calling checkFramebufferStatus with target = READ_FRAMEBUFFER should return 0.
-PASS calling checkFramebufferStatus with target = READ_FRAMEBUFFER should generate INVALID_ENUM.
-PASS calling bindFramebuffer with target = READ_FRAMEBUFFER should generate INVALID_ENUM.
-PASS calling bindFramebuffer with target = READ_FRAMEBUFFER should not change FRAMEBUFFER_BINDING.
-PASS calling getFramebufferAttachmentParameter with target = READ_FRAMEBUFFER should generate INVALID_ENUM.
-PASS calling framebufferTexImage2D with target = READ_FRAMEBUFFER should generate INVALID_ENUM.
-PASS calling framebufferRenderbuffer with target = READ_FRAMEBUFFER should generate INVALID_ENUM.
-PASS calling framebufferTexImage2D with attachment = COLOR_ATTACHMENT1 should generate INVALID_ENUM.
-PASS calling framebufferRenderbuffer with attachment = COLOR_ATTACHMENT1 should generate INVALID_ENUM.
-PASS calling getFramebufferAttachmentParameter with pname = GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING should generate INVALID_ENUM.
-PASS attaching a texture to a framebuffer should succeed.
-PASS detaching a texture from a framebuffer should succeed.
-PASS calling framebufferTexture2D with non-zero mipmap level should generate INVALID_VALUE.
-PASS attaching a renderbuffer to a framebuffer should succeed.
-PASS detaching a renderbuffer from a framebuffer should succeed.
-PASS binding default (null) framebuffer should succeed.
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-PASS successfullyParsed is true
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-TEST COMPLETE
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