Add compile time checks against longs being used in IPC structs on 32 bit Android.

content/browser/fileapi/fileapi_message_filter_unittest.cc

Index: content/browser/fileapi/fileapi_message_filter_unittest.cc
diff --git a/content/browser/fileapi/fileapi_message_filter_unittest.cc b/content/browser/fileapi/fileapi_message_filter_unittest.cc
index 1fe224e38ecba17fd310d91a8d50b49449452aea..b7d61e389d79b7a121621a016289bf69be17c360 100644
--- a/content/browser/fileapi/fileapi_message_filter_unittest.cc
+++ b/content/browser/fileapi/fileapi_message_filter_unittest.cc
@@ -249,7 +249,7 @@ TEST_F(FileAPIMessageFilterTest, BuildStreamWithSharedMemory) {
   ASSERT_TRUE(shared_memory->CreateAndMapAnonymous(kFakeData.size()));
   memcpy(shared_memory->memory(), kFakeData.data(), kFakeData.size());
   StreamHostMsg_SyncAppendSharedMemory append_message(
-      kUrl, shared_memory->handle(), kFakeData.size());
+      kUrl, shared_memory->handle(), static_cast<uint32_t>(kFakeData.size()));
   EXPECT_TRUE(filter_->OnMessageReceived(append_message));
 
   StreamHostMsg_FinishBuilding finish_message(kUrl);