Pepper flash search-path for package adobe-flashplugin

Since version 54, the chromium distribution package does not contain
the pepper flash plugin anymore. Because of this, the plugin cannot
be installed using the Ubuntu package "pepperflashplugin-nonfree"
anymore (because the package pulled the plugin from the chromium
distribution).
The plugin is also contained in the package adobe-flashplugin, which
installs the file to /usr/lib/adobe-flashplugin/libpepflashplayer.so.

[ChangeLog] Pepper flash is now also searched in /usr/lib/adobe-flashplugin/

Change-Id: I7c135a2eac1628b0d338bbfed07695c9578458e6
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/core/content_client_qt.cpp

@@ -119,7 +119,8 @@ void AddPepperFlashFromSystem(std::vector<content::PepperPluginInfo>* plugins)
 #endif
 #if defined(Q_OS_LINUX)
     pluginPaths << "/opt/google/chrome/PepperFlash/libpepflashplayer.so" // Google Chrome
-                << "/usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so" // Ubuntu
+                << "/usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so" // Ubuntu, package pepperflashplugin-nonfree
+                << "/usr/lib/adobe-flashplugin/libpepflashplayer.so" // Ubuntu, package adobe-flashplugin
                 << "/usr/lib/PepperFlash/libpepflashplayer.so" // Arch
                 << "/usr/lib64/chromium/PepperFlash/libpepflashplayer.so"; // OpenSuSE
 #endif

src/webengine/doc/src/qtwebengine-features.qdoc

@@ -151,6 +151,7 @@
         \li Linux
             \code
             /usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so
+            /usr/lib/adobe-flashplugin/libpepflashplayer.so
             /usr/lib/PepperFlash/libpepflashplayer.so
             /usr/lib64/chromium/PepperFlash/libpepflashplayer.so
             \endcode