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

cc/output/output_surface.cc

Index: cc/output/output_surface.cc
diff --git a/cc/output/output_surface.cc b/cc/output/output_surface.cc
index b3b18da4fa54b5151e1fae0a50de30dcff06663c..64b1d3bb12b0625b43bf2052a6e0281b5afa97bb 100644
--- a/cc/output/output_surface.cc
+++ b/cc/output/output_surface.cc
@@ -124,7 +124,7 @@ OutputSurface::OutputSurface(
 #if defined(ENABLE_VULKAN)
     scoped_refptr<VulkanContextProvider> vulkan_context_provider,
 #endif
-    scoped_ptr<SoftwareOutputDevice> software_device)
+    std::unique_ptr<SoftwareOutputDevice> software_device)
     : client_(NULL),
       context_provider_(std::move(context_provider)),
       worker_context_provider_(std::move(worker_context_provider)),
@@ -168,7 +168,8 @@ OutputSurface::OutputSurface(
                     nullptr) {}
 #endif
 
-OutputSurface::OutputSurface(scoped_ptr<SoftwareOutputDevice> software_device)
+OutputSurface::OutputSurface(
+    std::unique_ptr<SoftwareOutputDevice> software_device)
     : OutputSurface(nullptr,
                     nullptr,
 #if defined(ENABLE_VULKAN)
@@ -177,8 +178,9 @@ OutputSurface::OutputSurface(scoped_ptr<SoftwareOutputDevice> software_device)
                     std::move(software_device)) {
 }
 
-OutputSurface::OutputSurface(scoped_refptr<ContextProvider> context_provider,
-                             scoped_ptr<SoftwareOutputDevice> software_device)
+OutputSurface::OutputSurface(
+    scoped_refptr<ContextProvider> context_provider,
+    std::unique_ptr<SoftwareOutputDevice> software_device)
     : OutputSurface(std::move(context_provider),
                     nullptr,
 #if defined(ENABLE_VULKAN)