linux: enable pepper plugin

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 03d7feed2e0a2da7ac60f1b329625f6e9477d080..8a0910b813f9875abb6f68caf9d30a322373a64f 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -36,6 +36,7 @@
         '../third_party/sqlite/sqlite.gyp:*',
         '../third_party/WebKit/WebKit/chromium/WebKit.gyp:*',
         '../third_party/zlib/zlib.gyp:*',
+        '../webkit/tools/pepper_test_plugin/pepper_test_plugin.gyp:*',
         '../webkit/tools/test_shell/test_shell.gyp:*',
         '../webkit/webkit.gyp:*',
         'util/build_util.gyp:*',
@@ -55,7 +56,6 @@
         ['OS=="mac"', {
           'dependencies': [
             '../third_party/ocmock/ocmock.gyp:*',
-            '../webkit/tools/pepper_test_plugin/pepper_test_plugin.gyp:*',
           ],
         }],
         ['OS=="linux"', {
@@ -101,9 +101,6 @@
             '../third_party/bspatch/bspatch.gyp:*',
             '../third_party/gles2_book/gles2_book.gyp:*',
             '../tools/memory_watcher/memory_watcher.gyp:*',
-            # As of now, build machines do not have GL headers to compile this
-            # TODO(sehr,brettw, neb): Make this unconditional.
-            '../webkit/tools/pepper_test_plugin/pepper_test_plugin.gyp:*',
           ],
         }, {
           'dependencies': [