android: Replace base::MakeUnique with std::make_unique

Should use std::make_unique directly instead of using base::MakeUnique
since August[1]. So, this change removes usages of base::MakeUnique in
//chrome/browser/android.

This change removes `#include "base/memory/ptr_util.h"` if it's no more
used in files. (Might not remove if base::WrapUnique is used)

This change also adds `#include <memory>` header except the following
two cases:
  - Not add the header if the file contains the <memory> header
  - Not add the header if the related header contains <memory> header
    (The style guide[2] says that foo.cc can rely on foo.h's includes)

Confirmed no additional lint errors(by `git cl lint`) after this change.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/616016
[2] https://google.github.io/styleguide/cppguide.html#Names_and_Order_of_Includes

Bug: 755727
Change-Id: I216f1a4180be7604d91132cedf48eb9c015074a7
Reviewed-on: https://chromium-review.googlesource.com/867172
Reviewed-by: Bernhard Bauer <[email protected]>
Commit-Queue: Jinho Bang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#529310}
diff --git a/chrome/browser/android/devtools_manager_delegate_android.cc b/chrome/browser/android/devtools_manager_delegate_android.cc
index 7ab36d0..6fe04d8 100644
--- a/chrome/browser/android/devtools_manager_delegate_android.cc
+++ b/chrome/browser/android/devtools_manager_delegate_android.cc
@@ -7,7 +7,6 @@
 #include <map>
 
 #include "base/bind.h"
-#include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ -183,7 +182,7 @@
     return result;
 
   result = DevToolsAgentHost::Forward(base::IntToString(tab->GetAndroidId()),
-                                      base::MakeUnique<TabProxyDelegate>(tab));
+                                      std::make_unique<TabProxyDelegate>(tab));
   tab->SetDevToolsAgentHost(result);
   return result;
 }