Adjust a test expectation in the stack sampler unit test.

base/profiler/stack_sampling_profiler_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <cstdlib>
 #include <memory>
 #include <utility>
@@ skipping 529 matching lines @@
     // TargetThread::OtherLibraryCallback
     EXPECT_EQ(2, sample.frames.end() - end_frame)
         << "Stack:\n"
         << FormatSampleForDiagnosticOutput(sample, profile.modules);
   } else {
     // We didn't wait for the asynchonous unloading to complete, so the results
     // are non-deterministic: if the library finished unloading we should have
     // the same stack as |wait_until_unloaded|, if not we should have the full
     // stack. The important thing is that we should not crash.
 
-    if ((sample.frames.end() - 1) - end_frame == 2) {
+    if (sample.frames.end() - end_frame == 2) {
       // This is the same case as |wait_until_unloaded|.
       return;
     }
 
     // Check that the stack contains a frame for
     // TargetThread::CallThroughOtherLibrary().
     Frames::const_iterator other_library_frame = FindFirstFrameWithinFunction(
         sample, &TargetThread::CallThroughOtherLibrary);
     ASSERT_TRUE(other_library_frame != sample.frames.end())
         << "Function at "
@@ skipping 456 matching lines @@
 #if defined(STACK_SAMPLING_PROFILER_SUPPORTED)
 #define MAYBE_UnloadedLibrary UnloadedLibrary
 #else
 #define MAYBE_UnloadedLibrary DISABLED_UnloadedLibrary
 #endif
 TEST(StackSamplingProfilerTest, MAYBE_UnloadedLibrary) {
   TestLibraryUnload(true);
 }
 
 }  // namespace base