Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/gperftools/malloc_extension_c.h

Index: third_party/tcmalloc/vendor/src/gperftools/malloc_extension_c.h
diff --git a/third_party/tcmalloc/vendor/src/google/malloc_extension_c.h b/third_party/tcmalloc/vendor/src/gperftools/malloc_extension_c.h
similarity index 92%
copy from third_party/tcmalloc/vendor/src/google/malloc_extension_c.h
copy to third_party/tcmalloc/vendor/src/gperftools/malloc_extension_c.h
index e3f7f79f27b8761f1b84577f74dffdb83e8a1ee8..72a0a7c173304d60f685137241b88afafd80657b 100644
--- a/third_party/tcmalloc/vendor/src/google/malloc_extension_c.h
+++ b/third_party/tcmalloc/vendor/src/gperftools/malloc_extension_c.h
@@ -58,9 +58,9 @@ extern "C" {
 #define kMallocExtensionHistogramSize 64
 
 PERFTOOLS_DLL_DECL int MallocExtension_VerifyAllMemory(void);
-PERFTOOLS_DLL_DECL int MallocExtension_VerifyNewMemory(void* p);
-PERFTOOLS_DLL_DECL int MallocExtension_VerifyArrayNewMemory(void* p);
-PERFTOOLS_DLL_DECL int MallocExtension_VerifyMallocMemory(void* p);
+PERFTOOLS_DLL_DECL int MallocExtension_VerifyNewMemory(const void* p);
+PERFTOOLS_DLL_DECL int MallocExtension_VerifyArrayNewMemory(const void* p);
+PERFTOOLS_DLL_DECL int MallocExtension_VerifyMallocMemory(const void* p);
 PERFTOOLS_DLL_DECL int MallocExtension_MallocMemoryStats(int* blocks, size_t* total,
                                       int histogram[kMallocExtensionHistogramSize]);
 PERFTOOLS_DLL_DECL void MallocExtension_GetStats(char* buffer, int buffer_length);
@@ -78,7 +78,7 @@ PERFTOOLS_DLL_DECL void MallocExtension_MarkThreadBusy(void);
 PERFTOOLS_DLL_DECL void MallocExtension_ReleaseToSystem(size_t num_bytes);
 PERFTOOLS_DLL_DECL void MallocExtension_ReleaseFreeMemory(void);
 PERFTOOLS_DLL_DECL size_t MallocExtension_GetEstimatedAllocatedSize(size_t size);
-PERFTOOLS_DLL_DECL size_t MallocExtension_GetAllocatedSize(void* p);
+PERFTOOLS_DLL_DECL size_t MallocExtension_GetAllocatedSize(const void* p);
 
 /*
  * NOTE: These enum values MUST be kept in sync with the version in