Fix ANGLEGetDisplayPlatform after method deprecation This function verifies that the methods that are named match methods of PlatformMethods. Since 8074061d2, some methods have been deprecated, which caused this function to fail to return the platform methods for the Android platform. The Android platform doesn't actually use the deprecated functions. In this change, ANGLEGetDisplayPlatform is made to ignore deprecated methods (whose names start with `placeholder`) to maintain backwards compatibility. This can be reverted once Android and any other potential user is fixed. Bug: b/229651121 Change-Id: I1d51a6e064f1dec128f67c0991cd8fb2646ad2b1 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3594804 Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>