Enable ClangTidy check modernize-make-unique.

The majority of existing call sites were automatically updated using
clang-tidy -fix. A small handful required a manual update,
e.g. CppCodeGen.

This check is a bit lenient, and in particular will not flag cases like
`std::unique_ptr<Base>(new Derived())` which is still pretty common
throughout our codebase. This CL does not attempt to replace all the
cases that ClangTidy does not flag.

Change-Id: I5eba48ef880e25d22de80f321a68c389ba769e36
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307459
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/src/gpu/effects/generated/GrCircleEffect.cpp b/src/gpu/effects/generated/GrCircleEffect.cpp
index 692f157..3871b73 100644
--- a/src/gpu/effects/generated/GrCircleEffect.cpp
+++ b/src/gpu/effects/generated/GrCircleEffect.cpp
@@ -119,7 +119,7 @@
     this->cloneAndRegisterAllChildProcessors(src);
 }
 std::unique_ptr<GrFragmentProcessor> GrCircleEffect::clone() const {
-    return std::unique_ptr<GrFragmentProcessor>(new GrCircleEffect(*this));
+    return std::make_unique<GrCircleEffect>(*this);
 }
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrCircleEffect);
 #if GR_TEST_UTILS