--- a/ipc/chromium/src/chrome/common/ipc_channel.h
+++ b/ipc/chromium/src/chrome/common/ipc_channel.h
@@ -45,17 +45,17 @@ class Channel : public Message::Sender {
   enum Mode {
     MODE_SERVER,
     MODE_CLIENT
   };
 
   enum {
     // The maximum message size in bytes. Attempting to receive a
     // message of this size or bigger results in a channel error.
-    kMaximumMessageSize = 128 * 1024 * 1024,
+    kMaximumMessageSize = 256 * 1024 * 1024,
 
     // Ammount of data to read at once from the pipe.
     kReadBufferSize = 4 * 1024,
 
     // Maximum size of a message that we allow to be copied (rather than moved).
     kMaxCopySize = 32 * 1024,
   };