Allow speech input feature to be disabled.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 78f01c3fedc2c4509ba8d422e859e8693ee6acef..9e581bce89abb8ec23152b22cd39254be8233277 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1946,6 +1946,11 @@
             ['exclude', '^browser/policy/'],
           ],
         }],
+        ['input_speech==0', {
+          'sources/': [
+            ['exclude', '^browser/speech/'],
+          ],
+        }],
         ['safe_browsing==1', {
           'defines': [
             'ENABLE_SAFE_BROWSING',
@@ -2607,6 +2612,12 @@
             ['exclude', '^browser/policy/'],
           ],
         }],
+        ['input_speech==0', {
+          'sources/': [
+            ['exclude', '^browser/speech/'],
+            ['exclude', '^../content/browser/speech/'],
+          ],
+        }],
         ['safe_browsing==1', {
           'defines': [
             'ENABLE_SAFE_BROWSING',