zlib/google: Use UncheckedMalloc() to allocate memory instead of malloc().

On Windows, malloc() (in Chrome) never returns nullptr, instead triggering an
OOM. Explicitly using UncheckedMalloc() to get nullptr in case of allocation
failure.

Bug: 905777
Change-Id: I56bf677710b606cc6ca69073f4cc2d34c4ef19dd
Reviewed-on: https://chromium-review.googlesource.com/c/1344064Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609991}

third_party/zlib/google/compression_utils.cc

@@ -11,6 +11,7 @@
 
 #include "base/bit_cast.h"
 #include "base/logging.h"
+#include "base/process/memory.h"
 #include "base/sys_byteorder.h"
 
 #if defined(USE_SYSTEM_ZLIB)
@@ -130,10 +131,11 @@ bool GzipCompress(base::StringPiece input, std::string* output) {
 
   uLongf compressed_data_size =
       kGzipZlibHeaderDifferenceBytes + compressBound(input_size);
-  Bytef* compressed_data =
-      reinterpret_cast<Bytef*>(malloc(compressed_data_size));
-  if (!compressed_data)
+  Bytef* compressed_data;
+  if (!base::UncheckedMalloc(compressed_data_size,
+                             reinterpret_cast<void**>(&compressed_data))) {
     return false;
+  }
 
   if (GzipCompressHelper(compressed_data, &compressed_data_size,
                          bit_cast<const Bytef*>(input.data()),