Remove unused trait imports

[sanxiyn]

No description provided.

[rust-highfive]

r? @alexcrichton

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[alexcrichton]

@bors: r+ 3ee54ec

[bors]

⌛ Testing commit 3ee54ec with merge b205d39...

[bors]

💔 Test failed - cargo-cross-linux

[alexcrichton]

@bors: retry

On Tue, May 3, 2016 at 8:43 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - cargo-cross-linux
http://buildbot.rust-lang.org/builders/cargo-cross-linux/builds/42

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#2636 (comment)

[bors]

⚡ Previous build results for cargo-linux-32, cargo-linux-64 are reusable. Rebuilding only cargo-cross-linux, cargo-mac-32, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64...

[bors]

💔 Test failed - cargo-cross-linux

[alexcrichton]

@bors: r+ ad369c9

[bors]

⌛ Testing commit ad369c9 with merge 26288f7...

[bors]

💔 Test failed - cargo-win-gnu-32

[alexcrichton]

@bors: retry

On Tue, May 3, 2016 at 10:18 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - cargo-win-gnu-32
http://buildbot.rust-lang.org/builders/cargo-win-gnu-32/builds/471

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You are receiving this because you were mentioned.
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#2636 (comment)

[bors]

⚡ Previous build results for cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64 are reusable. Rebuilding only cargo-cross-linux, cargo-win-gnu-32...

[bors]

☀️ Test successful - cargo-cross-linux, cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64