[LSC] Replace base::string16 with std::u16string in //[a-e]*

This change replaces base::string16 with std::u16string in //[a-e]*.

Reproduction steps:
$ git grep -lw 'base::string16' [a-e]* | \
      xargs sed -i 's/\bbase::string16\b/std::u16string/g'
$ git cl format

Bug: 1184339
Change-Id: I7930c2c3ae510b6d2232cc1b3a927ad90515ffe9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2752407
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Owners-Override: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#862191}

diff --git a/base/file_version_info_win.h b/base/file_version_info_win.h
index 65849668..4ff8319ea 100644
--- a/base/file_version_info_win.h
+++ b/base/file_version_info_win.h

@@ -28,24 +28,24 @@
 
   // Accessors to the different version properties.
   // Returns an empty string if the property is not found.
-  base::string16 company_name() override;
-  base::string16 company_short_name() override;
-  base::string16 product_name() override;
-  base::string16 product_short_name() override;
-  base::string16 internal_name() override;
-  base::string16 product_version() override;
-  base::string16 special_build() override;
-  base::string16 original_filename() override;
-  base::string16 file_description() override;
-  base::string16 file_version() override;
+  std::u16string company_name() override;
+  std::u16string company_short_name() override;
+  std::u16string product_name() override;
+  std::u16string product_short_name() override;
+  std::u16string internal_name() override;
+  std::u16string product_version() override;
+  std::u16string special_build() override;
+  std::u16string original_filename() override;
+  std::u16string file_description() override;
+  std::u16string file_version() override;
 
   // Lets you access other properties not covered above. |value| is only
   // modified if GetValue() returns true.
-  bool GetValue(const char16_t* name, base::string16* value) const;
+  bool GetValue(const char16_t* name, std::u16string* value) const;
 
   // Similar to GetValue but returns a string16 (empty string if the property
   // does not exist).
-  base::string16 GetStringValue(const char16_t* name) const;
+  std::u16string GetStringValue(const char16_t* name) const;
 
   // Get file version number in dotted version format.
   base::Version GetFileVersion() const;