Description: Partially revert 6f23ef1 to fix build failure
 ../../base/process/memory_linux.cc:106:13: error: use of undeclared identifier '__libc_malloc'
Origin: https://chromium.googlesource.com/chromium/src/+/6f23ef1f7305a75c2db96afde705bddcddde1f05
Author: Olivier Tilloy <olivier.tilloy@canonical.com>

--- a/base/process/memory_linux.cc
+++ b/base/process/memory_linux.cc
@@ -42,6 +42,12 @@ void OnNoMemory() {
 
 }  // namespace
 
+#if !BUILDFLAG(USE_ALLOCATOR_SHIM) && defined(LIBC_GLIBC) && !defined(USE_TCMALLOC)
+extern "C" {
+void* __libc_malloc(size_t size);
+}  // extern C
+#endif
+
 void EnableTerminationOnHeapCorruption() {
   // On Linux, there nothing to do AFAIK.
 }