webkit: Fix build in ISO C++ 11 mode

Change-Id: I32b3121ae46678f847dcd74ea74484aaf8f34eaf
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
fix ambiguous conversion errors for gcc 4.8

Change-Id: Ifa1a4073a805485a38344a7170ce381e6f0bbbd9

Conflicts:
	Source/WebCore/platform/audio/android/AudioBusAndroid.cpp
	Source/WebKit/android/webaudio/WebAudioDecoderAndroid.cpp