Drop noexcept from an aligned new operator

operator new is declared without noexcept in the standard library, and
used to be redeclared with noexcept in //base. That is inconsistent and
ill-formed in C++17.

This drops the problematic noexcept.

Change-Id: I7016b8fb935ba592f37fc0db97f040c717b8932c
Reviewed-on: https://chromium-review.googlesource.com/c/1414215
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Primiano Tucci <primiano@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623165}

base/allocator/allocator_shim_override_cpp_symbols.h

@@ -123,9 +123,8 @@ ALIGN_DEL_NOTHROW(void* p, ALIGN_VAL_T, const std::nothrow_t&) __THROW {
   ShimCppDelete(p);
 }
 
-SHIM_ALWAYS_EXPORT ALIGN_LINKAGE void* ALIGN_NEW_ARR(
-    std::size_t size,
-    ALIGN_VAL_T alignment) __THROW {
+SHIM_ALWAYS_EXPORT ALIGN_LINKAGE void* ALIGN_NEW_ARR(std::size_t size,
+                                                     ALIGN_VAL_T alignment) {
   return ShimCppAlignedNew(size, static_cast<size_t>(alignment));
 }