preprocessor: Miscellaneous cleanups

- Use full header paths in includes
- Use ASSERT instead of assert
- Use angle::NonCopyable instead of PP_DISALLOW_COPY_AND_ASSIGN
- Use range-for in a couple places
- Remove pp_utils.h

BUG=angleproject:1522

Change-Id: If107fef89e8465bca65cf664926d1051c5d1e232
Reviewed-on: https://chromium-review.googlesource.com/387212
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/Program.cpp b/src/libANGLE/Program.cpp
index 7f4226d..29be350 100644
--- a/src/libANGLE/Program.cpp
+++ b/src/libANGLE/Program.cpp
@@ -523,7 +523,7 @@
                     if (arrayIndex == GL_INVALID_INDEX)
                         arrayIndex = 0;
 
-                    ret.name = in.mappedName + "[" + std::to_string(arrayIndex) + "]";
+                    ret.name = in.mappedName + "[" + ToString(arrayIndex) + "]";
                 }
                 else
                 {