Remove oilpan build configuration vestiges.

third_party/WebKit/Source/config.gyp

Index: third_party/WebKit/Source/config.gyp
diff --git a/third_party/WebKit/Source/config.gyp b/third_party/WebKit/Source/config.gyp
index 9d5e020c235d061c8eb71c4fbc4bf296af881930..7874b976c84a15c5acf8363e6e043bc034615749 100644
--- a/third_party/WebKit/Source/config.gyp
+++ b/third_party/WebKit/Source/config.gyp
@@ -32,10 +32,6 @@
     # If set to 1, doesn't compile debug symbols into webcore reducing the
     # size of the binary and increasing the speed of gdb.  gcc only.
     'remove_webcore_debug_symbols%': 0,
-    # Enables the Oilpan garbage-collection infrastructure.
-    # If you update the default value below, be sure to update the one in
-    # build/features.gypi, too!
-    'enable_oilpan%': 1,
     # If set to 1 (default) and using clang, the Blink GC plugin will check the
     # usage of the garbage-collection infrastructure during compilation.
     'blink_gc_plugin%': 1,
@@ -96,13 +92,13 @@
         }],
         # Only enable the blink_gc_plugin when using clang and chrome plugins.
         ['blink_gc_plugin==1 and clang==1 and clang_use_chrome_plugins==1', {
-          'cflags': ['<!@(python <(DEPTH)/tools/clang/scripts/blink_gc_plugin_flags.py enable-oilpan=<(enable_oilpan) <(blink_gc_plugin_flags))'],
+          'cflags': ['<!@(python <(DEPTH)/tools/clang/scripts/blink_gc_plugin_flags.py <(blink_gc_plugin_flags))'],
           'xcode_settings': {
-            'OTHER_CFLAGS': ['<!@(python <(DEPTH)/tools/clang/scripts/blink_gc_plugin_flags.py enable-oilpan=<(enable_oilpan) <(blink_gc_plugin_flags))'],
+            'OTHER_CFLAGS': ['<!@(python <(DEPTH)/tools/clang/scripts/blink_gc_plugin_flags.py <(blink_gc_plugin_flags))'],
           },
           'msvs_settings': {
             'VCCLCompilerTool': {
-              'AdditionalOptions': ['<!@(python <(DEPTH)/tools/clang/scripts/blink_gc_plugin_flags.py enable-oilpan=<(enable_oilpan) <(blink_gc_plugin_flags))'],
+              'AdditionalOptions': ['<!@(python <(DEPTH)/tools/clang/scripts/blink_gc_plugin_flags.py <(blink_gc_plugin_flags))'],
             },
           },
         }],