Move Partition Allocator into Chromium base.

docs/memory-infra/README.md

 # MemoryInfra
 
 MemoryInfra is a timeline-based profiling system integrated in chrome://tracing.
 It aims at creating Chrome-scale memory measurement tooling so that on any
 Chrome in the world --- desktop, mobile, Chrome OS or any other --- with the
 click of a button you can understand where memory is being used in your system.
 
 [TOC]
 
 ## Getting Started
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 The **tracing column in gray** reports memory that is used to collect all of the
 above information. This memory would not be used if tracing were not enabled,
 and it is discounted from malloc and the blue columns.
 
 <!-- TODO(primiano): Improve this. https://crbug.com/??? -->
 
 [oilpan]:     /third_party/WebKit/Source/platform/heap/BlinkGCDesign.md
 [cc-memory]:  probe-cc.md
 [gpu-memory]: probe-gpu.md
-[partalloc]:  /third_party/WebKit/Source/wtf/allocator/PartitionAlloc.md
+[partalloc]:  /base/allocator/partition_allocator/PartitionAlloc.md
 
 ## Related Pages
 
  * [Adding MemoryInfra Tracing to a Component](adding_memory_infra_tracing.md)
  * [GPU Memory Tracing](probe-gpu.md)
  * [Heap Profiler Internals](heap_profiler_internals.md)
  * [Heap Profiling with MemoryInfra](heap_profiler.md)
  * [Startup Tracing with MemoryInfra](memory_infra_startup_tracing.md)
 
 ## Rationale
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 Chrome-side design docs:
 
 <iframe width="100%" height="300px" src="https://docs.google.com/a/google.com/embeddedfolderview?id=0B3KuDeqD-lVJfndSa2dleUQtMnZDeWpPZk1JV0QtbVM5STkwWms4YThzQ0pGTmU1QU9kNVk">
 </iframe>
 
 Catapult-side design docs:
 
 <iframe width="100%" height="300px" src="https://docs.google.com/a/google.com/embeddedfolderview?id=0B3KuDeqD-lVJfm10bXd5YmRNWUpKOElOWS0xdU1tMmV1S3F4aHo0ZDJLTmtGRy1qVnQtVWM">
 </iframe>