Fix fx_basic_memmgr_unittest.cpp under stricter GN rules

core/src/fxcrt/fx_basic_memmgr_unittest.cpp

 // Copyright 2015 PDFium 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 <limits>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "../../include/fxcrt/fx_memory.h"
 
 namespace {
 
 const size_t kMaxByteAlloc = std::numeric_limits<size_t>::max();
 const size_t kMaxIntAlloc = kMaxByteAlloc / sizeof(int);
 const size_t kOverflowIntAlloc = kMaxIntAlloc + 100;
 const size_t kWidth = 640;
 const size_t kOverflowIntAlloc2D = kMaxIntAlloc / kWidth + 10;
 
 }  // namespace
 
 // TODO(tsepez): re-enable OOM tests if we can find a way to
 // prevent it from hosing the bots.
 TEST(fxcrt, DISABLED_FX_AllocOOM) {
-    EXPECT_DEATH_IF_SUPPORTED(FX_Alloc(int, kMaxIntAlloc), "");
+    EXPECT_DEATH_IF_SUPPORTED((void) FX_Alloc(int, kMaxIntAlloc), "");
 
     int* ptr = FX_Alloc(int, 1);
     EXPECT_TRUE(ptr);
-    EXPECT_DEATH_IF_SUPPORTED(FX_Realloc(int, ptr, kMaxIntAlloc), "");
+    EXPECT_DEATH_IF_SUPPORTED((void) FX_Realloc(int, ptr, kMaxIntAlloc), "");
     FX_Free(ptr);
 }
 
 TEST(fxcrt, FX_AllocOverflow) {
-    EXPECT_DEATH_IF_SUPPORTED(FX_Alloc(int, kOverflowIntAlloc), "");
+    EXPECT_DEATH_IF_SUPPORTED((void) FX_Alloc(int, kOverflowIntAlloc), "");
 
     int* ptr = FX_Alloc(int, 1);
     EXPECT_TRUE(ptr);
-    EXPECT_DEATH_IF_SUPPORTED(FX_Realloc(int, ptr, kOverflowIntAlloc), "");
+    EXPECT_DEATH_IF_SUPPORTED(
+        (void) FX_Realloc(int, ptr, kOverflowIntAlloc), "");
     FX_Free(ptr);
 }
 
 TEST(fxcrt, FX_AllocOverflow2D) {
     EXPECT_DEATH_IF_SUPPORTED(
-        FX_Alloc2D(int, kWidth, kOverflowIntAlloc2D), "");
+        (void) FX_Alloc2D(int, kWidth, kOverflowIntAlloc2D), "");
 }
 
 TEST(fxcrt, DISABLED_FX_TryAllocOOM) {
     EXPECT_FALSE(FX_TryAlloc(int, kMaxIntAlloc));
 
     int* ptr = FX_Alloc(int, 1);
     EXPECT_TRUE(ptr);
     EXPECT_FALSE(FX_TryRealloc(int, ptr, kMaxIntAlloc));
     FX_Free(ptr);
 }
 
 TEST(fxcrt, FX_TryAllocOverflow) {
     EXPECT_FALSE(FX_TryAlloc(int, kOverflowIntAlloc));
 
     int* ptr = FX_Alloc(int, 1);
     EXPECT_TRUE(ptr);
     EXPECT_FALSE(FX_TryRealloc(int, ptr, kOverflowIntAlloc));
     FX_Free(ptr);
 }
 
 TEST(fxcrt, DISABLED_FXMEM_DefaultOOM) {
     EXPECT_FALSE(FXMEM_DefaultAlloc(kMaxByteAlloc, 0));
 
     void* ptr = FXMEM_DefaultAlloc(1, 0);
     EXPECT_TRUE(ptr);
     EXPECT_FALSE(FXMEM_DefaultRealloc(ptr, kMaxByteAlloc, 0));
     FXMEM_DefaultFree(ptr, 0);
 }