Android: Remove description of ping-pong protocol

Has not been used for a while.

Change-Id: I504ca8e83c388e3b588cc27aa978d1151ccee452
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/plugins/android/androidrunner.cpp

@@ -34,7 +34,6 @@
 #include "androidavdmanager.h"
 #include "androidrunnerworker.h"
 
-#include <QHostAddress>
 #include <coreplugin/messagemanager.h>
 #include <projectexplorer/projectexplorer.h>
 #include <projectexplorer/projectexplorersettings.h>
@@ -42,6 +41,7 @@
 #include <projectexplorer/target.h>
 #include <utils/url.h>
 
+#include <QHostAddress>
 #include <QLoggingCategory>
 
 namespace {
@@ -51,70 +51,6 @@ static Q_LOGGING_CATEGORY(androidRunnerLog, "qtc.android.run.androidrunner", QtW
 using namespace ProjectExplorer;
 using namespace Utils;
 
-/*
-    This uses explicit handshakes between the application and the
-    gdbserver start and the host side by using the gdbserver socket.
-
-    For the handshake there are two mechanisms. Only the first method works
-    on Android 5.x devices and is chosen as default option. The second
-    method can be enabled by setting the QTC_ANDROID_USE_FILE_HANDSHAKE
-    environment variable before starting Qt Creator.
-
-    1.) This method uses a TCP server on the Android device which starts
-    listening for incoming connections. The socket is forwarded by adb
-    and creator connects to it. This is the only method that works
-    on Android 5.x devices.
-
-    2.) This method uses two files ("ping" file in the application dir,
-    "pong" file in /data/local/tmp/qt).
-
-    The sequence is as follows:
-
-     host: adb forward debugsocket :5039
-
-     host: adb shell rm pong file
-     host: adb shell am start
-     host: loop until ping file appears
-
-         app start up: launch gdbserver --multi +debug-socket
-         app start up: loop until debug socket appear
-
-             gdbserver: normal start up including opening debug-socket,
-                        not yet attached to any process
-
-         app start up: 1.) set up ping connection or 2.) touch ping file
-         app start up: 1.) accept() or 2.) loop until pong file appears
-
-     host: start gdb
-     host: gdb: set up binary, breakpoints, path etc
-     host: gdb: target extended-remote :5039
-
-             gdbserver: accepts connection from gdb
-
-     host: gdb: attach <application-pid>
-
-             gdbserver: attaches to the application
-                        and stops it
-
-         app start up: stopped now (it is still waiting for
-                       the pong anyway)
-
-     host: gdb: continue
-
-             gdbserver: resumes application
-
-         app start up: resumed (still waiting for the pong)
-
-     host: 1) write "ok" to ping pong connection or 2.) write pong file
-
-         app start up: java code continues now, the process
-                       is already fully under control
-                       of gdbserver. Breakpoints are set etc,
-                       we are before main.
-         app start up: native code launches
-
-*/
-
 namespace Android {
 namespace Internal {