Revert 268371 "base: Increase emulated discardable memory limit."

base/memory/discardable_memory_emulated.cc

Index: base/memory/discardable_memory_emulated.cc
diff --git a/base/memory/discardable_memory_emulated.cc b/base/memory/discardable_memory_emulated.cc
index b70540236a8d51184ecf2526a6ba67b56e2ed145..140fdb01e28952acd80025c5bda9591fa67276c3 100644
--- a/base/memory/discardable_memory_emulated.cc
+++ b/base/memory/discardable_memory_emulated.cc
@@ -10,10 +10,11 @@
 namespace base {
 namespace {
 
-// This is admittedly pretty magical. It's approximately enough memory for eight
+// This is admittedly pretty magical. It's approximately enough memory for four
 // 2560x1600 images.
-const size_t kEmulatedMemoryLimit = 128 * 1024 * 1024;
-const size_t kEmulatedBytesToKeepUnderModeratePressure = 12 * 1024 * 1024;
+const size_t kEmulatedMemoryLimit = 64 * 1024 * 1024;
+const size_t kEmulatedBytesToKeepUnderModeratePressure =
+    kEmulatedMemoryLimit / 4;
 
 struct SharedState {
   SharedState()