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operator delete apparently isn't throw() with msvs (at least in
_HAS_EXCEPTIONS=0 builds like ours). This fixes the two remaining
warnings in this file:

..\..\base\allocator/generic_allocators.cc(31,6) :  warning(clang): function previously declared with an implicit exception specification redeclared with an explicit exception specification [-Wimplicit-exception-spec-mismatch]
void operator delete(void* p) throw() {
     ^
E:\b\depot_tools\win_toolchain\vs2013_files\win8sdk\bin\..\..\VC\include\new(52,16) :  note(clang): previous declaration is here
void __CRTDECL operator delete(void *) _THROW0();
               ^
In file included from ..\..\base\allocator\allocator_shim.cc:334:
..\..\base\allocator/generic_allocators.cc(39,6) :  warning(clang): function previously declared with an implicit exception specification redeclared with an explicit exception specification [-Wimplicit-exception-spec-mismatch]
void operator delete[](void* p) throw() {
     ^
E:\b\depot_tools\win_toolchain\vs2013_files\win8sdk\bin\..\..\VC\include\crtdbg.h(1054,16) :  note(clang): previous declaration is here
void __CRTDECL operator delete[](void *);
               ^
2 warnings generated.

There also wasn't a std::nothrow overload for delete, so add that for
completeness while here. (For C++14, we might have to add sized
overloads too at some point.)

BUG=82385
NOTRY=true

Review URL: https://codereview.chromium.org/447513002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288129 0039d316-1c4b-4281-b951-d872f2087c98