Use common stack trace code in Android port

base/debug/stack_trace_android.cc

Index: base/debug/stack_trace_android.cc
diff --git a/base/debug/stack_trace_android.cc b/base/debug/stack_trace_android.cc
index 9d7c8315a9d5a115c6fa5d4e97c84679c171b77c..7d74bec54eccbad5fc138a10473cba76199c1681 100644
--- a/base/debug/stack_trace_android.cc
+++ b/base/debug/stack_trace_android.cc
@@ -16,17 +16,6 @@ namespace debug {
 StackTrace::StackTrace() {
 }
 
-StackTrace::StackTrace(const void* const* trace, size_t count) {
-}
-
-StackTrace::~StackTrace() {
-}
-
-const void* const* StackTrace::Addresses(size_t* count) const {
-  NOTIMPLEMENTED();
-  return NULL;
-}
-
 // Sends fake SIGSTKFLT signals to let the Android linker and debuggerd dump
 // stack. See inlined comments and Android bionic/linker/debugger.c and
 // system/core/debuggerd/debuggerd.c for details.
@@ -55,10 +44,5 @@ void StackTrace::OutputToStream(std::ostream* os) const {
   NOTIMPLEMENTED();
 }
 
-std::string StackTrace::ToString() const {
-  NOTIMPLEMENTED();
-  return "";
-}
-
 }  // namespace debug
 }  // namespace base