Remove dead code.

BUG=None

Review URL: https://codereview.chromium.org/142043009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247415 0039d316-1c4b-4281-b951-d872f2087c98
NaCl: Update revision in DEPS, r12642 -> r12657

This pulls in the following Native Client changes:

r12643: (mseaborn) Fix warning from Clang 3.4 about unused variable in ARM build
r12644: (bsy) mmap main nexe if fd is "essentially immutable"
r12645: (kschimpf) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r12646: (mseaborn) PNaCl: Update Clang revision in pnacl/COMPONENT_REVISIONS: remove localmods
r12647: (mseaborn) Make debug stub partly work under qemu-arm: change breakpoint instruction
r12648: (mseaborn) Debug stub: Enable most tests under qemu-arm
r12649: (jfb) Update TOOL_REVISIONS for PNaCl r12640->r12646
r12650: (petarj) [MIPS] Update untrusted.gypi
r12651: (mseaborn) GDB tests: Factor out duplication in nacl.scons file
r12652: (dschuff) PNaCl: Update Binutils revision in pnacl/COMPONENT_REVISIONS
r12653: (sbc) Update ARM sysroot image builder.
r12656: (dschuff) Install MinGW on windows hosts and build libdl

BUG=none
TEST=browser_tests and nacl_integration

Review URL: https://codereview.chromium.org/143733004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247416 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247417 0039d316-1c4b-4281-b951-d872f2087c98
Expire the Welcome Notification After 1 Day

Added in logic to automatically dismiss the welcome notification after
showing it for 1 day.

Also updated a unit test to handle this case with the timer. This involved
removing and mocking the message loop PostTask support since both
TestSimpleTaskRunner and MessageLoop cannot coexist in a single test as both
require initializing ThreadTaskRunnerHandle.

BUG=337503
TEST=Get the Welcome Notification to show, and take action (or inaction) to
advance the clock by one day. After one day, the welcome notification should
automatically hide.

Review URL: https://codereview.chromium.org/145493006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247418 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247417
SVN changes up to revision 247418