Fix the new Mojo EDK's mojo_system_unittests to pass in release builds and also on Linux.

mojo/edk/embedder/simple_platform_shared_buffer_unittest.cc

Index: mojo/edk/embedder/simple_platform_shared_buffer_unittest.cc
diff --git a/mojo/edk/embedder/simple_platform_shared_buffer_unittest.cc b/mojo/edk/embedder/simple_platform_shared_buffer_unittest.cc
index 27c3bf5b02ad6573a43068efcad69d5a0bf8743d..f8b0d2d2df8955d3a11679715688eccd299fb97b 100644
--- a/mojo/edk/embedder/simple_platform_shared_buffer_unittest.cc
+++ b/mojo/edk/embedder/simple_platform_shared_buffer_unittest.cc
@@ -134,7 +134,8 @@ TEST(SimplePlatformSharedBufferTest, TooBig) {
   // If |size_t| is 32-bit, it's quite possible/likely that |Create()| succeeds
   // (since it only involves creating a 4 GB file).
   size_t max_size = std::numeric_limits<size_t>::max();
-  if (max_size > static_cast<size_t>(base::SysInfo::AmountOfVirtualMemory()))
+  if (base::SysInfo::AmountOfVirtualMemory() &&

[jam, 2015/12/03 03:42:36]

I added this recently to make the test pass on Windows XP, but didn't test it on
Linux after. Apparently this returns 0 on Linux.

[yzshen1, 2015/12/03 18:04:33]

nit: please consider adding the reason as a comment in the code.

+      max_size > static_cast<size_t>(base::SysInfo::AmountOfVirtualMemory()))
     max_size = static_cast<size_t>(base::SysInfo::AmountOfVirtualMemory());
   scoped_refptr<SimplePlatformSharedBuffer> buffer(
       SimplePlatformSharedBuffer::Create(max_size));