Revert 56796 - Sbox IPC fix...

sandbox/src/crosscall_params.h

Index: sandbox/src/crosscall_params.h
===================================================================
--- sandbox/src/crosscall_params.h	(revision 56797)
+++ sandbox/src/crosscall_params.h	(working copy)
@@ -169,33 +169,30 @@
 // blob to be complex.
 //
 // As is, this class assumes that the layout of the blob is as follows. Assume
-// that NUMBER_PARAMS = 2 and a 32-bit build:
+// that NUMBER_PARAMS = 2:
 //
-// [ tag                4 bytes]
-// [ IsOnOut            4 bytes]
-// [ call return       52 bytes]
-// [ params count       4 bytes]
-// [ parameter 0 type   4 bytes]
-// [ parameter 0 offset 4 bytes] ---delta to ---\
-// [ parameter 0 size   4 bytes]                |
-// [ parameter 1 type   4 bytes]                |
-// [ parameter 1 offset 4 bytes] ---------------|--\
-// [ parameter 1 size   4 bytes]                |  |
-// [ parameter 2 type   4 bytes]                |  |
-// [ parameter 2 offset 4 bytes] ----------------------\
-// [ parameter 2 size   4 bytes]                |  |   |
-// |---------------------------|                |  |   |
-// | value 0     (x bytes)     | <--------------/  |   |
-// | value 1     (y bytes)     | <-----------------/   |
-// |                           |                       |
-// | end of buffer             | <---------------------/
-// |---------------------------|
+// [ tag              4 bytes]
+// [ IsOnOut          4 bytes]
+// [ call return     52 bytes]
+// [ params count     4 bytes]
+// [ parameter 0 type 4 bytes]
+// [ parameter 0 /\   4 bytes] ---delta to ---\
+// [ parameter 0 size 4 bytes]                |
+// [ parameter 1 type 4 bytes]                |
+// [ parameter 1 /\   4 bytes]                |
+// [ parameter 1 size 4 bytes]                |
+// [ parameter 2 type 4 bytes]                |
+// [ parameter 2 /\   4 bytes] ----------------------\
+// [ parameter 2 size 4 bytes]                |      |
+// |-------------------------|                |      |
+// |                         | <--------------/      |
+// |                         |                       |
+// |                         | <---------------------/
+// |-------------------------|
 //
 // Note that the actual number of params is NUMBER_PARAMS + 1
 // so that the size of each actual param can be computed from the difference
-// between one parameter and the next down. The offset of the last param
-// points to the end of the buffer and the type and size are undefined.
-//
+// between one parameter and the next down
 template <size_t NUMBER_PARAMS, size_t BLOCK_SIZE>
 class ActualCallParams : public CrossCallParams {
  public:
@@ -212,14 +209,6 @@
     param_info_[0].offset_ = parameters_ - reinterpret_cast<char*>(this);
   }
 
-  // Testing-only method. Allows setting the apparent size to a wrong value.
-  // returns the previous size.
-  size_t OverrideSize(size_t new_size) {
-    size_t previous_size = param_info_[NUMBER_PARAMS].offset_;
-    param_info_[NUMBER_PARAMS].offset_ = new_size;
-    return previous_size;
-  }
-
   // Copies each paramter into the internal buffer. For each you must supply:
   // index: 0 for the first param, 1 for the next an so on
   bool CopyParamIn(size_t index, const void* parameter_address, size_t size,