Remove unused helper function DispatchOnInstalledEvent.

Review URL: https://codereview.chromium.org/26411002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233237 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233237
GVDAH: fix crash on Android caused by invalid assumption of reentrancy on hash_map<>.

When a container's value's dtor might call another method of the container's,
one must ensure that the dtor is _not_ run in-line as the result of any of the
container's operations.  Specifically here the evil chain is:
GpuVideoEncodeAcceleratorHost::OnNotifyInputDone() -> frame_map_.erase()
VideoFrame::~VideoFrame()
RTCVideoEncoder::Impl::EncodeFrameFinished()
RTCVideoEncoder::Impl::EncodeOneFrame()
GpuVideoEncodeAcceleratorHost::Encode()
GpuVideoEncodeAcceleratorHost::frame_map_.insert()
aaaaaand, boom!

The code at HEAD is invalid for any platform (b/c nothing specs reentrancy for
hash_map) but only bit me on Android (where we use stlport unlike other
platforms).

NOTRY=true

Review URL: https://codereview.chromium.org/59863005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233238 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233238