Remove unused file.

Bug: None
Change-Id: Ie04e6c17a498bbec7b9fcf44441677432ea7dc46
Reviewed-on: https://webrtc-review.googlesource.com/99700
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24689}

sdk/objc/WebRTC.podspec

@@ -1,18 +0,0 @@
-Pod::Spec.new do |s|
-  s.name         = "WebRTC"
-  s.version      = "${FRAMEWORK_VERSION_NUMBER}"
-  s.summary      = "WebRTC SDK for iOS"
-  s.description  = <<-DESC
-    WebRTC is a free, open project that provides browsers and mobile
-    applications with Real-Time Communications (RTC) capabilities via simple
-    APIs.
-                   DESC
-  s.homepage     = "http://webrtc.org/"
-  s.license      = { :type => "BSD", :file => "LICENSE" }
-  s.author    = "Google Inc."
-
-  s.platform     = :ios, "9.0"
-
-  s.public_header_files = "WebRTC.framework/Headers/**/*.h"
-  s.vendored_frameworks = "WebRTC.framework"
-end