Revert of Rewrite clipboard write IPC handling to be easier to understand.

Revert of Rewrite clipboard write IPC handling to be easier to understand. (patchset #29 id:860001 of https://codereview.chromium.org/574273002/)

Reason for revert:
Reverting as broke components_unittests on a couple of bots:

https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/34215

https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/34215/steps/components_unittests/logs/PasteBookmarkFromURL
0 0x7fe36932398e base::debug::StackTrace::StackTrace()
#1 0x7fe3693234c3 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7fe35cb16cb0 \u003Cunknown>
#3 0x7fe35917c425 gsignal
#4 0x7fe35917fb8b abort
#5 0x7fe35977e5ad __gnu_debug::_Error_formatter::_M_error()
#6 0x7fe36ce9025f std::__debug::vector\u003C>::front()
#7 0x7fe36ce8e892 ui::Clipboard::DispatchObject()
#8 0x7fe36ce98183 ui::ClipboardAura::WriteObjects()
#9 0x7fe36cea124f ui::ScopedClipboardWriter::~ScopedClipboardWriter()
#10 0x0000007b6216 bookmarks::(anonymous namespace)::BookmarkUtilsTest_PasteBookmarkFromURL_Test::TestBody()
#11 0x000000ff3af3 testing::internal::HandleSehExceptionsInMethodIfSupported\u003C>()
#12 0x000000fe873e testing::internal::HandleExceptionsInMethodIfSupported\u003C>()
#13 0x000000fdd5b5 testing::Test::Run()
#14 0x000000fddcab testing::TestInfo::Run()
#15 0x000000fde29a testing::TestCase::Run()
#16 0x000000fe3793 testing::internal::UnitTestImpl::RunAllTests()
#17 0x000000ff0db3 testing::internal::HandleSehExceptionsInMethodIfSupported\u003C>()
#18 0x000000fe9f4e testing::internal::HandleExceptionsInMethodIfSupported\u003C>()
#19 0x000000fe3431 testing::UnitTest::Run()
#20 0x000000f7d511 RUN_ALL_TESTS()
#21 0x000000f7c4e7 base::TestSuite::Run()
#22 0x000000762b22 base::internal::RunnableAdapter\u003C>::Run()
#23 0x000000c5833f base::internal::InvokeHelper\u003C>::MakeItSo()
#24 0x000000c582ea base::internal::Invoker\u003C>::Run()
#25 0x0000007f099e base::Callback\u003C>::Run()
#26 0x000000f70299 base::(anonymous namespace)::LaunchUnitTestsInternal()
#27 0x000000f6ffd7 base::LaunchUnitTests()
#28 0x000000c58035 main
#29 0x7fe35916776d __libc_start_main
#30 0x000000533a55 \u003Cunknown>
  r8: 00007fe355d8f8c0  r9: 00007fff2537ee98 r10: 0000000000000008 r11: 0000000000000202
 r12: 00007fff2537f120 r13: 0000000000000000 r14: 0000000000000001 r15: 0000000000000000
  di: 0000000000003046  si: 0000000000003046  bp: 0000000000000001  bx: 00007fff2537f0e8
  dx: 0000000000000006  ax: 0000000000000000  cx: ffffffffffffffff  sp: 00007fff2537eee8
  ip: 00007fe35917c425 efl: 0000000000000202 cgf: 0000000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000

BookmarkUtilsTest.PasteBookmarkFromURL (run #2):
[ RUN      ] BookmarkUtilsTest.PasteBookmarkFromURL
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/debug/vector:336:
    error: attempt to access an element in an empty container.

Objects involved in the operation:
sequence "this" @ 0x0x22748bd981e0 {
}
Received signal 6
#0 0x7f00fb73798e base::debug::StackTrace::StackTrace()
#1 0x7f00fb7374c3 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7f00eef2acb0 \u003Cunknown>
#3 0x7f00eb590425 gsignal
#4 0x7f00eb593b8b abort
#5 0x7f00ebb925ad __gnu_debug::_Error_formatter::_M_error()
#6 0x7f00ff2a425f std::__debug::vector\u003C>::front()
#7 0x7f00ff2a2892 ui::Clipboard::DispatchObject()
#8 0x7f00ff2ac183 ui::ClipboardAura::WriteObjects()
#9 0x7f00ff2b524f ui::ScopedClipboardWriter::~ScopedClipboardWriter()
#10 0x0000007b6216 bookmarks::(anonymous namespace)::BookmarkUtilsTest_PasteBookmarkFromURL_Test::TestBody()
#11 0x000000ff3af3 testing::internal::HandleSehExceptionsInMethodIfSupported\u003C>()
#12 0x000000fe873e testing::internal::HandleExceptionsInMethodIfSupported\u003C>()
#13 0x000000fdd5b5 testing::Test::Run()
#14 0x000000fddcab testing::TestInfo::Run()
#15 0x000000fde29a testing::TestCase::Run()
#16 0x000000fe3793 testing::internal::UnitTestImpl::RunAllTests()
#17 0x000000ff0db3 testing::internal::HandleSehExceptionsInMethodIfSupported\u003C>()
#18 0x000000fe9f4e testing::internal::HandleExceptionsInMethodIfSupported\u003C>()
#19 0x000000fe3431 testing::UnitTest::Run()
#20 0x000000f7d511 RUN_ALL_TESTS()
#21 0x000000f7c4e7 base::TestSuite::Run()
#22 0x000000762b22 base::internal::RunnableAdapter\u003C>::Run()
#23 0x000000c5833f base::internal::InvokeHelper\u003C>::MakeItSo()
#24 0x000000c582ea base::internal::Invoker\u003C>::Run()
#25 0x0000007f099e base::Callback\u003C>::Run()
#26 0x000000f70299 base::(anonymous namespace)::LaunchUnitTestsInternal()
#27 0x000000f6ffd7 base::LaunchUnitTests()
#28 0x000000c58035 main
#29 0x7f00eb57b76d __libc_start_main
#30 0x000000533a55 \u003Cunknown>
  r8: 00007f00e81a38c0  r9: 00007fff75ebfcd8 r10: 0000000000000008 r11: 0000000000000202
 r12: 00007fff75ebff60 r13: 0000000000000000 r14: 0000000000000001 r15: 0000000000000000
  di: 00000000000031b5  si: 00000000000031b5  bp: 0000000000000001  bx: 00007fff75ebff28
  dx: 0000000000000006  ax: 0000000000000000  cx: ffffffffffffffff  sp: 00007fff75ebfd28
  ip: 00007f00eb590425 efl: 0000000000000202 cgf: 0000000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000

BookmarkUtilsTest.PasteBookmarkFromURL (run #3):
[ RUN      ] BookmarkUtilsTest.PasteBookmarkFromURL
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/debug/vector:336:
    error: attempt to access an element in an empty container.

Objects involved in the operation:
sequence "this" @ 0x0x3c55f5e901e0 {
}
Received signal 6
#0 0x7fed3784398e base::debug::StackTrace::StackTrace()
#1 0x7fed378434c3 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7fed2b036cb0 \u003Cunknown>
#3 0x7fed2769c425 gsignal
#4 0x7fed2769fb8b abort
#5 0x7fed27c9e5ad __gnu_debug::_Error_formatter::_M_error()
#6 0x7fed3b3b025f std::__debug::vector\u003C>::front()
#7 0x7fed3b3ae892 ui::Clipboard::DispatchObject()
#8 0x7fed3b3b8183 ui::ClipboardAura::WriteObjects()
#9 0x7fed3b3c124f ui::ScopedClipboardWriter::~ScopedClipboardWriter()
#10 0x0000007b6216 bookmarks::(anonymous namespace)::BookmarkUtilsTest_PasteBookmarkFromURL_Test::TestBody()
#11 0x000000ff3af3 testing::internal::HandleSehExceptionsInMethodIfSupported\u003C>()
#12 0x000000fe873e testing::internal::HandleExceptionsInMethodIfSupported\u003C>()
#13 0x000000fdd5b5 testing::Test::Run()
#14 0x000000fddcab testing::TestInfo::Run()
#15 0x000000fde29a testing::TestCase::Run()
#16 0x000000fe3793 testing::internal::UnitTestImpl::RunAllTests()
#17 0x000000ff0db3 testing::internal::HandleSehExceptionsInMethodIfSupported\u003C>()
#18 0x000000fe9f4e testing::internal::HandleExceptionsInMethodIfSupported\u003C>()
#19 0x000000fe3431 testing::UnitTest::Run()
#20 0x000000f7d511 RUN_ALL_TESTS()
#21 0x000000f7c4e7 base::TestSuite::Run()
#22 0x000000762b22 base::internal::RunnableAdapter\u003C>::Run()
#23 0x000000c5833f base::internal::InvokeHelper\u003C>::MakeItSo()
#24 0x000000c582ea base::internal::Invoker\u003C>::Run()
#25 0x0000007f099e base::Callback\u003C>::Run()
#26 0x000000f70299 base::(anonymous namespace)::LaunchUnitTestsInternal()
#27 0x000000f6ffd7 base::LaunchUnitTests()
#28 0x000000c58035 main
#29 0x7fed2768776d __libc_start_main
#30 0x000000533a55 \u003Cunknown>
  r8: 00007fed242af8c0  r9: 00007fff448a7b98 r10: 0000000000000008 r11: 0000000000000202
 r12: 00007fff448a7e20 r13: 0000000000000000 r14: 0000000000000001 r15: 0000000000000000
  di: 00000000000031b6  si: 00000000000031b6  bp: 0000000000000001  bx: 00007fff448a7de8
  dx: 0000000000000006  ax: 0000000000000000  cx: ffffffffffffffff  sp: 00007fff448a7be8
  ip: 00007fed2769c425 efl: 0000000000000202 cgf: 0000000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000

BookmarkUtilsTest.PasteBookmarkFromURL (run #4):
[ RUN      ] BookmarkUtilsTest.PasteBookmarkFromURL
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/debug/vector:336:
    error: attempt to access an element in an empty container.

Objects involved in the operation:
sequence "this" @ 0x0x116d121c1e0 {
}
Received signal 6
#0 0x7f155f68d98e base::debug::StackTrace::StackTrace()
#1 0x7f155f68d4c3 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7f1552e80cb0 \u003Cunknown>

Original issue's description:
> Rewrite clipboard write IPC handling to be easier to understand.
>
> The original implementation sent clipboard data to be written over IPC
> as a map of clipboard formats to 'parameters' for that format. The
> parameters were just vectors of byte vectors. Needless to say, this
> logic was complicated, fragile, and prone to bugs. In the browser
> process, this resulted in the IPC validation logic being scattered
> between ClipboardMessageFilter and Clipboard::DispatchObject.
>
> The rewrite adds an IPC message for each flavor of data that the
> renderer is allowed to write to the clipboard. On the browser side,
> the logic is simply delegated to ScopedClipboardWriter. Since the
> clipboard object map is no longer under the control of an untrusted
> process, this allows the removal of a lot of validation logic.
> Unfortunately, bitmap handling is still a bit complicated because it's
> sent over shared memory, but all the validation logic has been moved
> into ClipboardMessageFilter.
>
> BUG=319285
>
> Committed: https://crrev.com/a8095525d13449cd3ce2fe18d4f32f2133e69732
> Cr-Commit-Position: refs/heads/master@{#304895}

TBR=avi@chromium.org,jamesr@chromium.org,wfh@chromium.org,dcheng@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=319285
Committed: https://crrev.com/5f8381bf99d4438b160d7628230f3755cb838432
Cr-Commit-Position: refs/heads/master@{#304912}

[sky, 2014-11-19 22:43:43]

Created Revert of Rewrite clipboard write IPC handling to be easier to
understand.

[commit-bot: I haz the power, 2014-11-19 22:44:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/740003003/1

[commit-bot: I haz the power, 2014-11-19 22:46:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-19 22:48:00]

Patchset 1 (id:??) landed as
https://crrev.com/5f8381bf99d4438b160d7628230f3755cb838432
Cr-Commit-Position: refs/heads/master@{#304912}