Do not build device/bluetooth strings when extensions are disabled.

chrome/chrome_resources.gyp

Index: chrome/chrome_resources.gyp
diff --git a/chrome/chrome_resources.gyp b/chrome/chrome_resources.gyp
index 2342db8ed496d83eab3aa7f0efbc3ba83b448971..252bbb18dc2ebd2786355f2f56ccd631d77563cb 100644
--- a/chrome/chrome_resources.gyp
+++ b/chrome/chrome_resources.gyp
@@ -443,8 +443,6 @@
           'dependencies': [
             '<(DEPTH)/content/app/strings/content_strings.gyp:content_strings',
             '<(DEPTH)/content/content_resources.gyp:content_resources',
-            '<(DEPTH)/device/bluetooth/bluetooth_strings.gyp:device_bluetooth_strings',
-            '<(DEPTH)/extensions/extensions_strings.gyp:extensions_strings',
             '<(DEPTH)/third_party/WebKit/public/blink_resources.gyp:blink_resources',
             '<(DEPTH)/webkit/webkit_resources.gyp:webkit_resources',
           ],
@@ -466,6 +464,12 @@
             '<(DEPTH)/third_party/libaddressinput/libaddressinput.gyp:libaddressinput_strings',
           ],
         }],
+        ['enable_extensions==1', {
+          'dependencies': [
+            '<(DEPTH)/device/bluetooth/bluetooth_strings.gyp:device_bluetooth_strings',
+            '<(DEPTH)/extensions/extensions_strings.gyp:extensions_strings',
+          ],
+        }],
         ['OS != "mac" and OS != "ios"', {
           # Copy pak files to the product directory. These files will be picked
           # up by the following installer scripts: