Remove third_party/golang.org/x/mobile as it is no longer used with Go 1.5.

third_party/go/src/golang.org/x/mobile/sprite/clock/tween_test.go

Index: third_party/go/src/golang.org/x/mobile/sprite/clock/tween_test.go
diff --git a/third_party/go/src/golang.org/x/mobile/sprite/clock/tween_test.go b/third_party/go/src/golang.org/x/mobile/sprite/clock/tween_test.go
deleted file mode 100644
index 2bcf1012b0485fc59a9c5687afed5d3d73301e91..0000000000000000000000000000000000000000
--- a/third_party/go/src/golang.org/x/mobile/sprite/clock/tween_test.go
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package clock
-
-import "testing"
-
-func TestLinear(t *testing.T) {
-	t0 := Time(0)
-	t1 := Time(6 * 60)
-	now := Time(3 * 60)
-
-	if c := Linear(t0, t1, now); c != 0.5 {
-		t.Errorf("c=%.2f, want 0.5", c)
-	}
-}
-
-func TestCubicBezier(t *testing.T) {
-	t0 := Time(0)
-	t1 := Time(1e6)
-
-	tests := []struct {
-		x0, y0, x1, y1 float32
-		x, y           float32
-	}{
-		{0.00, 0.1, 0.4, 1.00, 0.0, 0.00},
-		{0.00, 0.1, 0.4, 1.00, 0.1, 0.26},
-		{0.00, 0.1, 0.4, 1.00, 0.5, 0.79},
-		{0.00, 0.1, 0.4, 1.00, 0.9, 0.99},
-		{0.00, 0.1, 0.4, 1.00, 1.0, 1.00},
-		{0.36, 0.2, 0.3, 0.85, 0.0, 0.0},
-		{0.36, 0.2, 0.3, 0.85, 0.3059, 0.3952},
-		{0.36, 0.2, 0.3, 0.85, 0.4493, 0.6408},
-		{0.36, 0.2, 0.3, 0.85, 0.8116, 0.9410},
-		{0.00, 0.0, 1.0, 1.00, 0.1, 0.1},
-		{0.00, 0.0, 1.0, 1.00, 0.5, 0.5},
-		{0.00, 0.0, 1.0, 1.00, 0.9, 0.9},
-		{0.42, 0.0, 1.0, 1.00, 0.0, 0.0},
-	}
-
-	for _, test := range tests {
-		cb := CubicBezier(test.x0, test.y0, test.x1, test.y1)
-		now := t0 + Time(float32(t1-t0)*test.x)
-		y := cb(t0, t1, now)
-
-		const epsilon = 0.01
-		diff := y - test.y
-		if diff < -epsilon || +epsilon < diff {
-			t.Errorf("CubicBezier(%.2f,%.2f,%.2f,%.2f): for x=%.2f got y=%.2f, want %.2f", test.x0, test.y0, test.x1, test.y1, test.x, y, test.y)
-		}
-	}
-}