Convert //cc from scoped_ptr to std::unique_ptr.

cc/output/shader_unittest.cc

Index: cc/output/shader_unittest.cc
diff --git a/cc/output/shader_unittest.cc b/cc/output/shader_unittest.cc
index 675e47fb26b2079f5769985a6d478b60b21635d4..78850184ad2f2fd7bd6cefe9751b43bbed099a32 100644
--- a/cc/output/shader_unittest.cc
+++ b/cc/output/shader_unittest.cc
@@ -15,8 +15,8 @@ namespace cc {
 TEST(ShaderTest, HighpThresholds) {
   // The test context always uses a mediump precision of 10 bits which
   // corresponds to a native highp threshold of 2^10 = 1024
-  scoped_ptr<TestWebGraphicsContext3D> stub_context =
-    TestWebGraphicsContext3D::Create();
+  std::unique_ptr<TestWebGraphicsContext3D> stub_context =
+      TestWebGraphicsContext3D::Create();
   TestGLES2Interface stub_gl(stub_context.get());
 
   int threshold_cache = 0;