Remove some unneeded reinterpret_casts

base/string16.cc

Index: base/string16.cc
diff --git a/base/string16.cc b/base/string16.cc
index 6fc38ce7cb09c78ec71d2f60c4a0f4bd5bce5b4e..a801610fe4decc89deda1d966b86481a16af8399 100644
--- a/base/string16.cc
+++ b/base/string16.cc
@@ -51,11 +51,11 @@ const char16* c16memchr(const char16* s, char16 c, size_t n) {
 }
 
 char16* c16memmove(char16* s1, const char16* s2, size_t n) {
-  return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
+  return static_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
 }
 
 char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
-  return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
+  return static_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
 }
 
 char16* c16memset(char16* s, char16 c, size_t n) {