Revert r253110: "Enable webrtc for webview."

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 72eb96d94c07528ee98e90e0bdf56958f8bef7b5..0c1d5c7971ef26acb192cd43c3bbbdb301ddc5aa 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -648,10 +648,17 @@
           'enable_autofill_dialog%': 1
         }],
 
-        ['OS=="android"', {
+        ['OS=="android" and android_webview_build==0', {
           'enable_webrtc%': 1,
         }],
 
+        # Disable WebRTC for building WebView as part of Android system.
+        # TODO(boliu): Decide if we want WebRTC, and if so, also merge
+        # the necessary third_party repositories.
+        ['OS=="android" and android_webview_build==1', {
+          'enable_webrtc%': 0,
+        }],
+
         ['OS=="ios"', {
           'disable_ftp_support%': 1,
           'enable_automation%': 0,