ipc: Add missing includes for USE_ATTACHMENT_BROKER.

ipc/ipc_message_unittest.cc

Index: ipc/ipc_message_unittest.cc
diff --git a/ipc/ipc_message_unittest.cc b/ipc/ipc_message_unittest.cc
index a4f9af07244c6491fdc303f565aafc67e081f0bc..bb133e5792fbfc70487daefe521332d81db980dd 100644
--- a/ipc/ipc_message_unittest.cc
+++ b/ipc/ipc_message_unittest.cc
@@ -11,6 +11,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
+#include "ipc/attachment_broker.h"
 #include "ipc/ipc_message_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -148,7 +149,7 @@ TEST(IPCMessageTest, FindNext) {
   // (but contains the message header)
   IPC::Message::FindNext(data_start, data_end - 1, &next);
   EXPECT_FALSE(next.message_found);
-#if USE_ATTACHMENT_BROKER
+#if USE_ATTACHMENT_BROKER && defined(OS_MACOSX) && !defined(OS_IOS)
   EXPECT_EQ(next.message_size, 0u);
 #else
   EXPECT_EQ(next.message_size, message.size());
@@ -184,7 +185,7 @@ TEST(IPCMessageTest, FindNextOverflow) {
   message.header()->payload_size = static_cast<uint32_t>(-1);
   IPC::Message::FindNext(data_start, data_end, &next);
   EXPECT_FALSE(next.message_found);
-#if USE_ATTACHMENT_BROKER
+#if USE_ATTACHMENT_BROKER && defined(OS_MACOSX) && !defined(OS_IOS)
   EXPECT_EQ(next.message_size, 0u);
 #else
   if (sizeof(size_t) > sizeof(uint32_t)) {
@@ -202,7 +203,7 @@ TEST(IPCMessageTest, FindNextOverflow) {
   message.header()->payload_size = std::numeric_limits<int32_t>::max();
   IPC::Message::FindNext(data_start, data_end, &next);
   EXPECT_FALSE(next.message_found);
-#if USE_ATTACHMENT_BROKER
+#if USE_ATTACHMENT_BROKER && defined(OS_MACOSX) && !defined(OS_IOS)
   EXPECT_EQ(next.message_size, 0u);
 #else
   EXPECT_EQ(next.message_size,