Explicitly call StringViewTemplate(char&) ctor in {Byte,Wide}String

No functional change, but illustrates what is silently going on
under the covers.

Change-Id: Ib750d78c4043cf886c256e77424820919b95eb08
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/93191
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/core/fxcrt/bytestring.h b/core/fxcrt/bytestring.h
index 01881f7..c8161db 100644
--- a/core/fxcrt/bytestring.h
+++ b/core/fxcrt/bytestring.h
@@ -253,7 +253,7 @@
   return ByteString(str1, ByteStringView(ch));
 }
 inline ByteString operator+(char ch, ByteStringView str2) {
-  return ByteString(ch, str2);
+  return ByteString(ByteStringView(ch), str2);
 }
 inline ByteString operator+(const ByteString& str1, const ByteString& str2) {
   return ByteString(str1.AsStringView(), str2.AsStringView());
@@ -262,7 +262,7 @@
   return ByteString(str1.AsStringView(), ByteStringView(ch));
 }
 inline ByteString operator+(char ch, const ByteString& str2) {
-  return ByteString(ch, str2.AsStringView());
+  return ByteString(ByteStringView(ch), str2.AsStringView());
 }
 inline ByteString operator+(const ByteString& str1, const char* str2) {
   return ByteString(str1.AsStringView(), str2);
diff --git a/core/fxcrt/widestring.h b/core/fxcrt/widestring.h
index 7fc26aa..6f1c11c 100644
--- a/core/fxcrt/widestring.h
+++ b/core/fxcrt/widestring.h
@@ -259,7 +259,7 @@
   return WideString(str1, WideStringView(ch));
 }
 inline WideString operator+(wchar_t ch, WideStringView str2) {
-  return WideString(ch, str2);
+  return WideString(WideStringView(ch), str2);
 }
 inline WideString operator+(const WideString& str1, const WideString& str2) {
   return WideString(str1.AsStringView(), str2.AsStringView());
@@ -268,7 +268,7 @@
   return WideString(str1.AsStringView(), WideStringView(ch));
 }
 inline WideString operator+(wchar_t ch, const WideString& str2) {
-  return WideString(ch, str2.AsStringView());
+  return WideString(WideStringView(ch), str2.AsStringView());
 }
 inline WideString operator+(const WideString& str1, const wchar_t* str2) {
   return WideString(str1.AsStringView(), str2);