Convert speech and session history browser_tests to run under content_browsertests.

chrome/browser_tests.isolate

Index: chrome/browser_tests.isolate
===================================================================
--- chrome/browser_tests.isolate	(revision 148625)
+++ chrome/browser_tests.isolate	(working copy)
@@ -87,8 +87,6 @@
       'test/data/content-sniffer-test3-frame.txt',
       'test/data/content-sniffer-test3.html',
       'test/data/nosniff-test.html',
-      'test/data/speech/basic_recognition.html',
-      'test/data/speech/grammar_attribute.html',
       'test/data/title2.html',
     ],
   },
@@ -640,8 +638,6 @@
           'test/data/showmodaldialog.html',
           'test/data/showmodaldialog_dialog.html',
           'test/data/simple.html',
-          'test/data/speech/basic_recognition.html',
-          'test/data/speech/grammar_attribute.html',
           'test/data/ssl/blank_page.html',
           'test/data/ssl/frame_left.html',
           'test/data/ssl/frame_right.html',