Increasing the Breakpad stack walker max scan limit from 30 to 40.

src/processor/stackwalker_x86_unittest.cc

 // Copyright (c) 2010, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 1210 matching lines @@
               frame1->windows_frame_info->type_);
     EXPECT_EQ("$T0 $ebp = $eip $T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = $L "
               "$T0 .cbSavedRegs - = $P $T0 8 + .cbParams + =",
               frame1->windows_frame_info->program_string);
     EXPECT_FALSE(frame1->windows_frame_info->allocates_base_pointer);
   }
 }
 
 // Scan the stack for a better return address and potentially skip frames
 // when the calculated return address is not in a known module.  Note, that
-// the span of this scan is somewhat arbitrarily limited to 120 search words
-// for the context frame and 30 search words (pointers) for the other frames:
-//     const int kRASearchWords = 30;
+// the span of this scan is somewhat arbitrarily limited to 160 search words
+// for the context frame and 40 search words (pointers) for the other frames:
+//     const int kRASearchWords = 40;
 // This means that frames can be skipped only when their size is relatively
 // small: smaller than 4 * kRASearchWords * sizeof(InstructionType)
 TEST_F(GetCallerFrame, ReturnAddressIsNotInKnownModule) {
   MockCodeModule msvcrt_dll(0x77be0000, 0x58000, "msvcrt.dll", "version1");
   SetModuleSymbols(&msvcrt_dll,  // msvcrt.dll
                    "PUBLIC 38180 0 wcsstr\n"
                    "STACK WIN 4 38180 61 10 0 8 0 0 0 1 $T0 $ebp = $eip $T0 "
                    "4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = $L $T0 .cbSavedRegs "
                    "- = $P $T0 4 + .cbParams + =\n");
 
@@ skipping 875 matching lines @@
     .D32(0x8036cc02)             // garbage
     .Mark(&frame1_esp);          // This effectively sets stack_section.start().
   raw_context.eip = 0x40004006;
   raw_context.ebp = frame0_ebp.Value();
   raw_context.ebx = 0x53d1379d;  // saved %esi
   raw_context.esi = 0x743833c9;  // callee's %esi
   raw_context.edi = 0x40005510;  // return address
   CheckWalk();
 }