Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/Protobuf.podspec

Index: third_party/protobuf/Protobuf.podspec
diff --git a/third_party/protobuf/Protobuf.podspec b/third_party/protobuf/Protobuf.podspec
deleted file mode 100644
index 0cd52025d23e25850cfd34b9017c85440e03c0c1..0000000000000000000000000000000000000000
--- a/third_party/protobuf/Protobuf.podspec
+++ /dev/null
@@ -1,24 +0,0 @@
-# This file describes to Cocoapods how to integrate the Objective-C runtime into a dependent
-# project.
-# Despite this file being specific to Objective-C, it needs to be on the root of the repository.
-# Otherwise, Cocoapods gives trouble like not picking up the license file correctly, or not letting
-# dependent projects use the :git notation to refer to the library.
-Pod::Spec.new do |s|
-  s.name     = 'Protobuf'
-  s.version  = '3.0.0-alpha-4-pre'
-  s.summary  = 'Protocol Buffers v.3 runtime library for Objective-C.'
-  s.homepage = 'https://github.com/google/protobuf'
-  s.license  = 'New BSD'
-  s.authors  = { 'The Protocol Buffers contributors' => 'protobuf@googlegroups.com' }
-
-  s.source_files = 'objectivec/GPBProtocolBuffers.{h,m}'
-  # GPBProtocolBuffers.{h,m} are umbrella files. We need Cocoapods to preserve the files imported by
-  # them.
-  s.preserve_paths = 'objectivec/*.{h,m}',
-                     'objectivec/google/protobuf/*.pbobjc.{h,m}'
-  s.header_mappings_dir = 'objectivec'
-
-  s.ios.deployment_target = '7.1'
-  s.osx.deployment_target = '10.9'
-  s.requires_arc = false
-end