Change OOMs to raise custom exception rather than breakpoint on Windows.

third_party/WebKit/Source/platform/heap/PageMemory.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/heap/PageMemory.h"
 
 #include "platform/heap/Heap.h"
 #include "wtf/Assertions.h"
 #include "wtf/Atomics.h"
 #include "wtf/allocator/PageAllocator.h"
@@ skipping 41 matching lines @@
     markPageUnused(page);
     if (!atomicDecrement(&m_numPages))
         delete this;
 }
 
 // TODO(haraken): Like partitionOutOfMemoryWithLotsOfUncommitedPages(),
 // we should probably have a way to distinguish physical memory OOM from
 // virtual address space OOM.
 static NEVER_INLINE void blinkGCOutOfMemory()
 {
-    IMMEDIATE_CRASH();
+    OOM_CRASH();
 }
 
 PageMemoryRegion* PageMemoryRegion::allocate(size_t size, unsigned numPages, RegionTree* regionTree)
 {
     // Round size up to the allocation granularity.
     size = (size + WTF::kPageAllocationGranularityOffsetMask) & WTF::kPageAllocationGranularityBaseMask;
     Address base = static_cast<Address>(WTF::allocPages(nullptr, size, blinkPageSize, WTF::PageInaccessible));
     if (!base)
         blinkGCOutOfMemory();
     return new PageMemoryRegion(base, size, numPages, regionTree);
@@ skipping 107 matching lines @@
     // Overallocate by 2 times OS page size to have space for a
     // guard page at the beginning and end of blink heap page.
     size_t allocationSize = payloadSize + 2 * blinkGuardPageSize;
     PageMemoryRegion* pageMemoryRegion = PageMemoryRegion::allocateLargePage(allocationSize, regionTree);
     PageMemory* storage = setupPageMemoryInRegion(pageMemoryRegion, 0, payloadSize);
     RELEASE_ASSERT(storage->commit());
     return storage;
 }
 
 } // namespace blink