Fix integer overflow in unittest.

base/sys_info_unittest.cc

Index: base/sys_info_unittest.cc
diff --git a/base/sys_info_unittest.cc b/base/sys_info_unittest.cc
index 3793ff33192f9f331e8f20cac9649af28a25378b..e80884b9b20ffb3b050cab7cfef093500a7cadb9 100644
--- a/base/sys_info_unittest.cc
+++ b/base/sys_info_unittest.cc
@@ -43,8 +43,8 @@ TEST_F(SysInfoTest, AmountOfAvailablePhysicalMemory) {
     EXPECT_LT(info.available, info.total);
     const int64_t amount = SysInfo::AmountOfAvailablePhysicalMemory(info);
     // We aren't actually testing that it's correct, just that it's sane.
-    EXPECT_GT(amount, info.free * 1024);
-    EXPECT_LT(amount, info.available * 1024);
+    EXPECT_GT(amount, static_cast<int64_t>(info.free) * 1024);
+    EXPECT_LT(amount / 1024, info.available);
     // Simulate as if there is no MemAvailable.
     info.available = 0;
   }
@@ -52,8 +52,8 @@ TEST_F(SysInfoTest, AmountOfAvailablePhysicalMemory) {
   // There is no MemAvailable. Check the fallback logic.
   const int64_t amount = SysInfo::AmountOfAvailablePhysicalMemory(info);
   // We aren't actually testing that it's correct, just that it's sane.
-  EXPECT_GT(amount, info.free * 1024);
-  EXPECT_LT(amount, info.total * 1024);
+  EXPECT_GT(amount, static_cast<int64_t>(info.free) * 1024);
+  EXPECT_LT(amount / 1024, info.total);
 }
 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)