Bug 812314 part 1 - Use fewer namespace js {...} blocks in .cpp files in js/src, js/src/builtin, js/src/vm. r=luke.

js/src/jsalloc.cpp

@@ -8,7 +8,7 @@
 #include "jsalloc.h"
 #include "jscntxt.h"
 
-namespace js {
+using namespace js;
 
 void *
 TempAllocPolicy::onOutOfMemory(void *p, size_t nbytes)
@@ -21,5 +21,3 @@ TempAllocPolicy::reportAllocOverflow() const
 {
     js_ReportAllocationOverflow(cx);
 }
-
-} /* namespace js */