Convert //android_webview to use std::unique_ptr

android_webview/native/aw_picture.cc

Index: android_webview/native/aw_picture.cc
diff --git a/android_webview/native/aw_picture.cc b/android_webview/native/aw_picture.cc
index 6c98d3db582ff78ccb237a64af059405dd1ad050..bb6e0f5ac4187a5064e3bb0fc0a200db52e223cc 100644
--- a/android_webview/native/aw_picture.cc
+++ b/android_webview/native/aw_picture.cc
@@ -34,9 +34,10 @@ void AwPicture::Draw(JNIEnv* env,
                      const JavaParamRef<jobject>& obj,
                      const JavaParamRef<jobject>& canvas) {
   const SkIRect bounds = picture_->cullRect().roundOut();
-  scoped_ptr<SoftwareCanvasHolder> canvas_holder = SoftwareCanvasHolder::Create(
-      canvas, gfx::Vector2d(), gfx::Size(bounds.width(), bounds.height()),
-      false);
+  std::unique_ptr<SoftwareCanvasHolder> canvas_holder =
+      SoftwareCanvasHolder::Create(canvas, gfx::Vector2d(),
+                                   gfx::Size(bounds.width(), bounds.height()),
+                                   false);
   if (!canvas_holder || !canvas_holder->GetCanvas()) {
     LOG(ERROR) << "Couldn't draw picture";
     return;