dlopen the sonamed libs directly, like it has already been done for libGL.so.1,
as we don't want to Depend on the -dev packages for the .so files:
- libosmesa.so.7: Mesa-libOSMesa-7.10-1
- libGLESv2.so.2: Mesa-libGLES-7.11-0.20110227.1
- libEGL.so.1: Mesa-libEGL-7.10-1

--- chromium-browser-21.0.1180.57/src/ui/gl/gl_implementation_linux.cc~	2012-07-27 04:02:32.000000000 +0300
+++ chromium-browser-21.0.1180.57/src/ui/gl/gl_implementation_linux.cc	2012-08-01 00:18:16.271402111 +0300
@@ -75,7 +75,7 @@
       }
 
       base::NativeLibrary library = LoadLibrary(
-          module_path.Append("libosmesa.so"));
+          module_path.Append("libosmesa.so.7"));
       if (!library)
         return false;