Remove '<(library)' in gyp files.

This will remove all usage of '<(library)' in all webrtc gyp files. 
Review URL: https://webrtc-codereview.appspot.com/1049005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3392 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/codecs/i420/main/source/i420.gypi

@@ -10,7 +10,7 @@
   'targets': [
     {
       'target_name': 'webrtc_i420',
-      'type': '<(library)',
+      'type': 'static_library',
       'dependencies': [
         '<(webrtc_root)/system_wrappers/source/system_wrappers.gyp:system_wrappers',
       ],

webrtc/modules/video_coding/codecs/test/video_codecs_test_framework.gypi

@@ -12,7 +12,7 @@
       'targets': [
         {
           'target_name': 'video_codecs_test_framework',
-          'type': '<(library)',
+          'type': 'static_library',
           'dependencies': [
             '<(webrtc_root)/test/test.gyp:test_support',
           ],

webrtc/modules/video_coding/codecs/test_framework/test_framework.gypi

@@ -12,7 +12,7 @@
       'targets': [
         {
           'target_name': 'test_framework',
-          'type': '<(library)',
+          'type': 'static_library',
 
           'dependencies': [
             '<(DEPTH)/testing/gtest.gyp:gtest',

webrtc/modules/video_coding/codecs/vp8/vp8.gyp

@@ -23,7 +23,7 @@
   'targets': [
     {
       'target_name': 'webrtc_vp8',
-      'type': '<(library)',
+      'type': 'static_library',
       'dependencies': [
         '<(webrtc_root)/system_wrappers/source/system_wrappers.gyp:system_wrappers',
         '<(webrtc_root)/common_video/common_video.gyp:common_video',

webrtc/modules/video_coding/main/source/video_coding.gypi

@@ -10,7 +10,7 @@
   'targets': [
     {
       'target_name': 'webrtc_video_coding',
-      'type': '<(library)',
+      'type': 'static_library',
       'dependencies': [
         'webrtc_i420',
         '<(webrtc_root)/common_video/common_video.gyp:common_video',