content: Use at most 128MB of discardable memory on Android.

content/child/child_discardable_shared_memory_manager.cc

Index: content/child/child_discardable_shared_memory_manager.cc
diff --git a/content/child/child_discardable_shared_memory_manager.cc b/content/child/child_discardable_shared_memory_manager.cc
index 6c67be86edb8bd714a19fc575b437a79ce744eb3..7c0f4d6201dcc7cb64e52602d53ae9a67124f054 100644
--- a/content/child/child_discardable_shared_memory_manager.cc
+++ b/content/child/child_discardable_shared_memory_manager.cc
@@ -22,12 +22,7 @@ namespace content {
 namespace {
 
 // Default allocation size.
-#if defined(OS_ANDROID)
-// Larger allocation size on Android to avoid reaching the FD-limit.
-const size_t kAllocationSize = 32 * 1024 * 1024;
-#else
 const size_t kAllocationSize = 4 * 1024 * 1024;
-#endif
 
 // Global atomic to generate unique discardable shared memory IDs.
 base::StaticAtomicSequenceNumber g_next_discardable_shared_memory_id;