Update some uses of char16 to use the base:: namespace.

content/renderer/android/address_detector.cc

Index: content/renderer/android/address_detector.cc
diff --git a/content/renderer/android/address_detector.cc b/content/renderer/android/address_detector.cc
index 6ab267fed3577ad814ff42cbe75da56a281de1eb..0a3d9e6845afc9dbcf25966c5a3c175c1705f696 100644
--- a/content/renderer/android/address_detector.cc
+++ b/content/renderer/android/address_detector.cc
@@ -40,7 +40,7 @@ std::string AddressDetector::GetContentText(const base::string16& text) {
   // Get the address and replace unicode bullets with commas.
   base::string16 address_16 = CollapseWhitespace(text, false);
   std::replace(address_16.begin(), address_16.end(),
-      static_cast<char16>(0x2022), static_cast<char16>(','));
+      static_cast<base::char16>(0x2022), static_cast<base::char16>(','));
   return base::UTF16ToUTF8(address_16);
 }