Remove CcTestArrayBufferAllocator

This is almost identical to V8's default array buffer allocator.  The only
difference is that 0 byte allocations are changed into 1 byte allocations.  We
do not seem to need this behavior, so it does not seem worth maintaining yet
another allocator.

Bug: 
Change-Id: I94f45f1276958791be9a6f2405fcfba8fa6eaa38
Reviewed-on: https://chromium-review.googlesource.com/505199Reviewed-by: Ben Smith <binji@chromium.org>
Commit-Queue: Eric Holk <eholk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45282}

test/cctest/cctest.cc

@@ -214,20 +214,6 @@ static void PrintTestList(CcTest* current) {
 }
 
 
-class CcTestArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
-  virtual void* Allocate(size_t length) {
-    void* data = AllocateUninitialized(length == 0 ? 1 : length);
-    return data == NULL ? data : memset(data, 0, length);
-  }
-  virtual void* AllocateUninitialized(size_t length) {
-    return malloc(length == 0 ? 1 : length);
-  }
-  virtual void Free(void* data, size_t length) { free(data); }
-  // TODO(dslomov): Remove when v8:2823 is fixed.
-  virtual void Free(void* data) { UNREACHABLE(); }
-};
-
-
 static void SuggestTestHarness(int tests) {
   if (tests == 0) return;
   printf("Running multiple tests in sequence is deprecated and may cause "
@@ -277,8 +263,8 @@ int main(int argc, char* argv[]) {
     v8::V8::RegisterDefaultSignalHandler();
   }
 
-  CcTestArrayBufferAllocator array_buffer_allocator;
-  CcTest::set_array_buffer_allocator(&array_buffer_allocator);
+  CcTest::set_array_buffer_allocator(
+      v8::ArrayBuffer::Allocator::NewDefaultAllocator());
 
   i::PrintExtension print_extension;
   v8::RegisterExtension(&print_extension);