GN: turn off ccache

infra/bots/recipe_modules/flavor/gn_android_flavor.py

Index: infra/bots/recipe_modules/flavor/gn_android_flavor.py
diff --git a/infra/bots/recipe_modules/flavor/gn_android_flavor.py b/infra/bots/recipe_modules/flavor/gn_android_flavor.py
index 12832ecc83ad88380d43dcabf034e5aedd4f2446..4cbaab38a6e10cfc6b1e1a89d863749a6db5d0e1 100644
--- a/infra/bots/recipe_modules/flavor/gn_android_flavor.py
+++ b/infra/bots/recipe_modules/flavor/gn_android_flavor.py
@@ -22,19 +22,10 @@ class GNAndroidFlavorUtils(default_flavor.DefaultFlavorUtils):
 
     assert compiler == 'Clang'  # At this rate we might not ever support GCC.
 
-    compiler_prefix = ''
-    extra_cflags = []
-    ccache = self.m.run.ccache()
-    if ccache:
-      compiler_prefix = ccache
-      extra_cflags.append('-Qunused-arguments')
-
     ndk_asset = 'android_ndk_linux' if os == 'Ubuntu' else 'android_ndk_darwin'
 
     quote = lambda x: '"%s"' % x
     gn_args = ' '.join('%s=%s' % (k,v) for (k,v) in sorted({
-        'compiler_prefix': quote(compiler_prefix),
-        'extra_cflags': quote(' '.join(extra_cflags)),
         'is_debug': 'true' if configuration == 'Debug' else 'false',
         'ndk': quote(self.m.vars.slave_dir.join(ndk_asset)),
         'target_cpu': quote(target_arch),