clang/win: Fix a few warnings/errors.

base/allocator/generic_allocators.cc

Index: base/allocator/generic_allocators.cc
diff --git a/base/allocator/generic_allocators.cc b/base/allocator/generic_allocators.cc
index 2726903faf3589e5f247a34c6eaf133b5a57c110..ae65f77a55bdb6d81259d9bfb5bd059578de25c3 100644
--- a/base/allocator/generic_allocators.cc
+++ b/base/allocator/generic_allocators.cc
@@ -28,7 +28,7 @@ void* operator new(size_t size) {
   return generic_cpp_alloc(size, false);
 }
 
-void operator delete(void* p) {
+void operator delete(void* p) throw() {
   free(p);
 }
 
@@ -36,7 +36,7 @@ void* operator new[](size_t size) {
   return generic_cpp_alloc(size, false);
 }
 
-void operator delete[](void* p) {
+void operator delete[](void* p) throw() {
   free(p);
 }
 
@@ -44,7 +44,7 @@ void* operator new(size_t size, const std::nothrow_t& nt) {
   return generic_cpp_alloc(size, true);
 }
 
-void operator delete(void* p, const std::nothrow_t& nt) {
+void operator delete(void* p, const std::nothrow_t& nt) throw() {
   free(p);
 }
 
@@ -52,7 +52,7 @@ void* operator new[](size_t size, const std::nothrow_t& nt) {
   return generic_cpp_alloc(size, true);
 }
 
-void operator delete[](void* p, const std::nothrow_t& nt) {
+void operator delete[](void* p, const std::nothrow_t& nt) throw() {
   free(p);
 }
 
@@ -83,10 +83,6 @@ void* calloc(size_t n, size_t elem_size) {
   return result;
 }
 
-void cfree(void* p) {
-  free(p);
-}
-
 #ifdef WIN32
 
 void* _recalloc(void* p, size_t n, size_t elem_size) {